Foundation Mathematics Primary 5 Angles

AOB is a straight line. If ∠AOC = 125°, what is the value of ∠BOC?

A 55°
B 125°
C 235°
D 35°
Show Worked Solution

Worked Solution

Step 1: Angles on a straight line add up to 180°. Step 2: So, ∠AOC + ∠BOC = 180°. Step 3: 125° + ∠BOC = 180°. Step 4: ∠BOC = 180° - 125° = 55°. Answer: 55°

Correct answer: 55°

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