Foundation Mathematics Primary 5 Geometry

Two angles of a triangle measure 70° and 55°. Find the third angle.

A 65°
B 125°
C 235°
D 55°
Show Worked Solution

Worked Solution

Step 1: Angles in a triangle sum to 180°. Step 2: Third angle = 180° − 70° − 55° = 180° − 125° = 55°. Answer: 55°

Correct answer: 55°

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