Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: F Tf.1 What Exactly Is a Radian?

For Teachers 9th - 10th Standards
For this task, students use a piece of string or another tool to measure the radius of the circle and then mark off the corresponding arc length on the unit circle as many times as they need to for 0, 1, 2, 3, 4, 5, and 6 radians. They...
eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 13.3 Sas Triangle Congruence

For Students 9th - 10th Standards
See how two triangles are congruent it means that all corresponding angle pairs and all corresponding sides are congruent.
Lesson Plan
Science and Mathematics Initiative for Learning Enhancement (SMILE)

Smile: Similarity

For Teachers 9th - 10th Standards
This site contains a lesson plan for high school age students. The objective is to discover the factor of proportionality in similar polygons and to relate this factor to the perimeters and areas of similar polygons.
Lesson Plan
Illustrative Mathematics

Illustrative Mathematics: G Co Properties of Congruent Triangles

For Teachers 9th - 10th Standards
The goal of this task is to understand how congruence of triangles, defined in terms of rigid motions, relates to the corresponding sides and angles of triangles. Aligns with G-CO.B.7.

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