G-SRT.2.5

Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.

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Formative Assessments
Formative Assessments
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Students are asked to decide if a basketball goal is regulation height and are given enough information to determine this using similar triangles.
Basketball Goal
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Students are asked to prove a specific diagonal of a rhombus bisects a pair of angles.
Prove Rhombus Diagonals Bisect Angles
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Students are asked to locate a pair of similar triangles in a diagram, explain why they are similar, and use the similarity to find an unknown length in the diagram.
Similar Triangles – 2
Virtual/Hands-on Manipulatives
Virtual/Hands-on Manipulatives
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Assessment Questions
Assessment Questions
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FSA Sample Question
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FSA Sample Question
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Videos of Expert Instruction
Videos of Expert Instruction
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Reflect for a moment on how to measure tall objects with mirrors and mathematics.
Measuring Height with Triangles and Mirrors
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Use Real Link and Title
Math Literature
Math Literature
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Milong and her friends are at the beach looking out onto the ocean on a clear day and they wonder how far away the horizon is.
How Far is the Horizon?
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The purpose of this task is to use similar triangles in order to study the coordinates of points which divide a line segment in a given ratio.
Finding Triangle Coordinates
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Pablo is practicing bank shots on a standard 4 ft.-by-8 ft. pool table that has a wall on each side, a pocket in each corner, and a pocket at the midpoint of each eight-foot side. Help answer his questions with angles!
Bank Shot
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Ever wanted to know how to fold a square into three parts? Here's your chance to learn.
Folding a Square into Thirds