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CK-12 STEM Flexbooks

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30-60-90 triangle
Read the Fine Print
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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 The text on the page points out that the sides of a 30-60-90 triangle are always in the ratio of 1 : 2 : root 3 Applet can be enlarged to full screen size for use with a classroom projector. This resource is a component of the Math Open Reference Interactive Geometry textbook project at http://www.mathopenref.com.

Subject:
Geometry
Mathematics
Material Type:
Reading
Simulation
Provider:
Math Open Reference
Author:
John Page
Date Added:
02/16/2011
3D Art
Conditional Remix & Share Permitted
CC BY-NC-SA
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This resource was created by Heidi Meyers, in collaboration with Dawn DeTurk, Hannah Blomstedt, and Julie Albrecht, as part of ESU2's Integrating the Arts project. This project is a four year initiative focused on integrating arts into the core curriculum through teacher education, practice, and coaching.

Subject:
Mathematics
Visual Arts
Material Type:
Lesson Plan
Author:
Arts ESU2
Date Added:
08/21/2022
3D Geometry - Naming 3D Shapes, Calculating Volume and Surface Area of Prisms, Cylinders, and Pyramids
Conditional Remix & Share Permitted
CC BY-NC
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https://www.educreations.com/lesson/view/3d-geometry/29389361/

NOTE: These are video notes! They are to be used AFTER instruction of these concepts or possibly as a precursor to the actual activities.

The link provided is a 27 minute video that I have used for notes with my 6th grade honors class. Obviously students shouldn't sit down and watch a 27 minute video all at once but it could be used in a part series as students are discovering these concepts in your class with actual activities.

I love Educreations because it's really easy to make a video, get a link that you can embed into any online classroom space, and a large portion of the storage space is free! YAY FREE!

Subject:
Mathematics
Material Type:
Lecture
Date Added:
02/12/2016
3 D Prin
Conditional Remix & Share Permitted
CC BY-NC
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Using a 3 D printer to model the printing of a mathematical object. Continueing on to calculate the volume of material used and total cost if the item based on this volume.

Subject:
Applied Science
Material Type:
Lesson
Date Added:
11/04/2014
3.MD.C.7b - Finding Area_Madison's Garden
Conditional Remix & Share Permitted
CC BY-NC-SA
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This task challenges students to find the area of different sections of a garden and the entire garden. With missing lengths and widths, the students are challenged to apply computation skills to finding missing measurements.

Subject:
Education
Mathematics
Material Type:
Activity/Lab
Assessment
Homework/Assignment
Date Added:
08/03/2018
3.MD.C.7d  Area & 3.MD.D.8 Perimeter of a Rectilinear Figure-Dog Park REMIX
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CC BY-NC-SA
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This task requires students to find the area and perimeter of a rectilinear figure and model their thinking through multiple equations. This task relates to the Common Core State Standards: 3.MD.C.7d, 3.MD.D.8, and 3.OA.D.8.

Subject:
Education
Mathematics
Material Type:
Activity/Lab
Assessment
Homework/Assignment
Date Added:
05/06/2020
3.MD.C.7d  Area of a Rectilinear Figure-Dog Park
Conditional Remix & Share Permitted
CC BY-NC-SA
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This task requires students to find the area of a rectilinear figure and model their thinking through multiple equations. This task relates to the Common Core State Standards: 3.MD.C.7d and 3.OA.D.8.

Subject:
Education
Mathematics
Material Type:
Activity/Lab
Assessment
Homework/Assignment
Date Added:
08/09/2018
3.MD.C.7d  Area of a Rectilinear Figure-Dog Park--Remix
Conditional Remix & Share Permitted
CC BY-NC-SA
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This task requires students to find the area of a rectilinear figure and model their thinking through multiple equations. This task relates to the Common Core State Standards: 3.MD.C.7d and 3.OA.D.8.

Subject:
Education
Mathematics
Material Type:
Activity/Lab
Assessment
Homework/Assignment
Date Added:
07/20/2021
3.MD.C.7d- Finding the Area of Rectilinear Figure_Karim's Garden
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CC BY-NC-SA
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This is a concrete referent reasoning task for Grade 3. Students need to use the diagram to find the information to find the area of a rectilinear figure. This is a task that would be a good starting point for solving problems for this standard.

Subject:
Education
Elementary Education
Mathematics
Material Type:
Activity/Lab
Date Added:
08/13/2018
#3 Math 7 Expressions, Equations, Inequalities 7.EEI.B.4b
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CC BY-NC-SA
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Write and/or solve linear equations in one variable.

b. Write and/or solve two-step equations of the form px + q = r and p(x + q) = r, where p, q and r are rational numbers, and interpret the meaning of the solution in the context of the problem.

Subject:
Mathematics
Material Type:
Activity/Lab
Author:
Liberty Public Schools
Date Added:
04/12/2021