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Activity
Curated OER

Unit Squares and Triangles

For Teachers 9th - 11th Standards
This is an interesting geometry problem. Given the figure, find the area of a triangle that is created by the intersecting lines. The solution requires one to use what he/she knows about coordinate geometry, as well as triangle and angle...
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Worksheet
Curated OER

Perimeter of Scalene Triangle

For Students 10th
In this geometry worksheet, 10th graders find the perimeter of scalene triangles, or triangles where the 3 sides are different lengths. There are 6 questions with an answer key.
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Lesson Plan
Curated OER

Geometry and Spatial Sense

For Teachers 6th - 8th
Students investigate geometric shapes in 2 and 3 dimensions.  In this geometry instructional activity, students create a model chocolate factory working in groups and using an actual cake.  Students take a quiz about measurement...