HOTS Mathematics Primary 5 Angles

Four rays meet at point O. The angles between consecutive rays are in the ratio 1 : 2 : 3 : 4. What is the size of the largest angle?

A 144°
B 90°
C 108°
D 160°
Show Worked Solution

Worked Solution

Step 1: Find the total number of ratio units. 1 + 2 + 3 + 4 = 10 units Step 2: Find the value of one unit. 360° ÷ 10 = 36° Step 3: Find the largest angle (ratio part 4). 4 × 36° = 144°

Correct answer: 144°

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