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Back to Prove theorems about triangles — Problem 1 · Task Set 10

Exercises: Prove Theorems About Triangles

Work through each section in order. Show your reasoning for proof-based problems.

Grade 9·21 problems·~35 min·Common Core Math - HS Geometry·standard·hsg-co-c-10
Work through problems with immediate feedback
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Fluency Practice

Apply the triangle theorems directly to find missing values.

Triangle PQR with angles 47° at P, 68° at Q, and an unknown angle at R.
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In triangle PQRPQR, m∠P=47∘m\angle P = 47^\circ and m∠Q=68∘m\angle Q = 68^\circ. Find m∠Rm\angle R.