Foundation Mathematics Primary 5 Angles

Angles at a point add up to 360°. Three angles at a point are 120°, 85°, and a third unknown angle. What is the value of the unknown angle?

A 155°
B 65°
C 205°
D 25°
Show Worked Solution

Worked Solution

Step 1: Angles at a point add up to 360°. Step 2: Sum of the known angles = 120° + 85° = 205°. Step 3: Unknown angle = 360° - 205° = 155°. Answer: 155°

Correct answer: 155°

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