Keywords: Plane Geometry
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Displaying 1-20 of 175 results.
3:4:5 triangle
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the properties of a 3:4:5 triangle - one of the Pythagorean triples. The applet shows a right triangle that can be resized by dragging any vertex. As it is dragged, the remaining vertices change so that the triangle's side remain in the ration ... More »
30-60-90 triangle
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the properties of a 30-60-90 triangle. The applet shows a right triangle that can be resized by dragging any vertex. As it is dragged, the remaining vertices change so that the triangle's angles remain 30 degrees, 60 degrees and 90 degrees ... More »
45-45-90 triangle
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the properties of a 45-45-90 isosceles right triangle. The applet shows a right triangle that can be resized by dragging any vertex. As it is dragged, the remaining vertices change so that the triangle's angles remain 45 degrees, 45 degrees ... More »
AAS Congruent Triangles
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that shows how triangles that have two angles and a non-included side the same must be congruent. The applet shows two triangles, one of which can be reshaped by dragging any vertex. The other changes to remain congruent to it and the two angles and non-included ... More »
Acute Angle
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate acute angles (those less than 90 deg). The applet presents an angle (initially acute) that the user can adjust by dragging the end points of the line segments forming the angle. As it changes it shows the angle measure and a message that ... More »
Acute triangle
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the three types of triangle: acute, obtuse and right. The applet shows a triangle that is initially acute (all angles less then 90 degrees) which the user can reshape by dragging any vertex. There is a message changes in real time while the ... More »
Adjacent Angles
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that show the concept of adjacent angles (two angles that share a common leg). The applet shows three line segments with a common endpoint. The user can move the center one and see that the angles on both sides (the adjacent angles) of it are affected. Applet ... More »
Adjacent arcs
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the the concept of adjacent arcs. The user can 3 drag points around a circle that define the endpoints of two adjacent arcs. Web page has the properties of adjacent arcs. Applet can be enlarged to full screen size for use with a classroom ... More »
Alternate Exterior Angles
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the alternate exterior angles that are formed where a transversal crosses two lines. The applets shows the two possible pairs of angles alternating when in animation mode. By dragging the three lines, it can be seen that the angles are congruent ... More »
Alternate Interior Angles
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the alternate interior angles that are formed where a transversal crosses two lines. The applets shows the two possible pairs of angles alternating when in animation mode. By dragging the three lines, it can be seen that the angles are congruent ... More »
Angle
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that introduce the concept of an angle. An angle made from two line segments is shown that the user can adjust by dragging the end points of the segments. In real time, as the angles is changed by the user, the angle measure in degrees is shown and a message ... More »
Angle bisector
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the bisector of an angle. An angle is shown using two line segments that can be dragged to change the angle measure. The angle is bisected by a line which moves while dragging to always divide the angle into two equal angles. The angle measures ... More »
Angle measure - degrees.
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| Type: | Course Related Materials |
Abstract: An interactive applet that acts as a 'digital manipulative' for explaining angles measured in degrees. The applet has an angle formed from two segment that can be dragged around in a circle. The angle measure is shown against a 'clock face' calibrated in degrees. The measures can be turned off for class ... More »
Apothem of a Regular Polygon
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the apothem of a regular polygon. The applet shows a regular polygon where the user can alter the number of sides and resize it by dragging any vertex. At all times, the apothem (line from center to a midpoint of a side) is drawn and it's ... More »
Arc
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the concept of an arc. The applet shows a circle with part of it highlighted to identify the arc. Each endpoint of the arc can be dragged to resize it. The web page ahs definitions and links to the properties of an arc. Applet can be enlarged ... More »
Arc Central Angle
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the the concept of the central angle subtended by an arc. The applet shows an arc and the corresponding central angle. As the arc endpoints are dragged the angle changes. The page gives the formula for the central angle based on the arc length ... More »
Arc Length
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the concept of arc length. The applet shows a circle with part of it's circumference highlighted and the central angle shown. As the user drags either end of the arc it is redrawn and the calculation for arc length changes as you drag. The ... More »
Arc Peripheral Angle
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the concept of the peripheral angle (inscribed angle) of an arc. This is the angle subtended at the circle circumference of an arc. The applet shows an arc with draggable end points and the angle it subtends at the circumference. It is seen ... More »
Area enclosed by a circle
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the area of a circle. A circle is shown with a point on the circumference that can be dragged to resize the circle. As the circle is resized, the radius and the area computation is shown changing in real time. The radius and formula can be ... More »
Area enclosed by an ellipse
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| Type: | Course Related Materials |
Abstract: An interactive applet and associated web page that demonstrate the area of an ellipse. The major and minor axes can be dragged and the area is continuously recalculated. The ellipse has a grid inside it so that students can estimate the area and compare the result to the calculated one. The web page ... More »
