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Back to Angles are taken to angles of the same measure — Problem 3 · Task Set 20

Exercises: Rigid Motions Preserve Angle Measure

Work through each section in order. A rigid motion is a translation, reflection, or rotation. For each problem, decide what the angle-preservation property tells you before measuring or computing. Show your work where indicated.

Grade 8·21 problems·~30 min·Common Core Math - Grade 8·standard·8-g-a-1b
Work through problems with immediate feedback
A

Recall / Warm-Up

These problems review skills you already know: classifying angles, naming rigid motions, and applying transformation rules.

A coordinate grid showing an angle with vertex B at (2, 1) and a dashed arrow indicating a translation.
1.

Apply the translation rule (x,y)→(x+3,y+2)(x, y) \rightarrow (x + 3, y + 2) to the vertex of an angle located at (2,1)(2, 1). What is the x-coordinate of the image vertex?