Foundation Mathematics Primary 4 Angles

Mei Ling places her protractor on her geometry homework so that one arm of the angle lines up with the 0° mark on the inner scale. The other arm points to the 135° mark on the inner scale. Find the size of the angle in degrees.

A 135°
B 45°
C 145°
D 55°
Show Worked Solution

Worked Solution

Step 1: Identify which scale to use. The first arm lines up with 0° on the INNER scale, so we read the inner scale.\n Step 2: Find where the second arm crosses the inner scale: it points to 135°.\n Step 3: The angle measures 135°. Answer: 135°

Correct answer: 135°

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