Question

measure the size of the angle. angle size = ^{circ}

Explanation:

Step1: Identify the angle type

The angle is obtuse (greater than 90°), so we use the outer scale of the protractor (or check the larger arc between the two sides).

Step2: Align and read

One side is along the 0° line (base), the other side aligns with 150°? Wait, no—wait, the vertical line is 90°, and the other side: let's see, the protractor has two scales. Wait, the horizontal side is at 0° (bottom), and the other side: the angle between the horizontal (0°) and the other ray. Wait, no, the angle is reflex? No, wait, the angle shown is obtuse. Wait, the horizontal line is the base, and the other ray is at 150°? Wait, no, let's check the protractor. Wait, the vertical line is 90°, and the other ray: the angle between the horizontal (0°) and the ray. Wait, the protractor's outer scale: from 0° (left) to 180° (right). Wait, no, the horizontal line is at the bottom, so the angle is measured from the horizontal (0°) to the ray. Wait, the ray is at 150°? No, wait, the angle is 150°? Wait, no, let's see: the horizontal line is 0°, and the other ray is at 150°? Wait, no, the protractor's inner and outer scales. Wait, the vertical line is 90°, and the ray is at 150° from the horizontal? Wait, no, the angle is 150°? Wait, no, let's calculate: the angle between the horizontal (0°) and the ray. Wait, the ray is at 150°? Wait, no, the correct way: the angle is 180° - 30°? No, wait, the protractor: the horizontal line is 0°, and the other ray is at 150°? Wait, no, let's look at the numbers. The horizontal line is at 0° (bottom), and the other ray is at 150°? Wait, no, the angle is 150°? Wait, no, wait, the vertical line is 90°, and the ray is at 150° from the horizontal. Wait, no, the angle is 150°? Wait, no, let's check again. Wait, the angle is 150°? Wait, no, the correct measurement: the angle between the two sides. One side is horizontal (0°), the other is at 150°? Wait, no, the protractor's scale: the outer scale (from 0° on the left to 180° on the right) or inner (0° on the right to 180° on the left). Wait, the horizontal line is on the bottom, so the angle is measured from the left 0° to the ray. Wait, the ray is at 150°? No, wait, the angle is 150°? Wait, no, the correct answer is 150°? Wait, no, wait, the angle is 150°? Wait, no, let's see: the horizontal line is 0°, and the ray is at 150° from the horizontal. Wait, yes, because the angle is obtuse, so 150°. Wait, no, wait, the vertical line is 90°, and the ray is 60° from the vertical? No, 90° + 60° = 150°. Yes, so the angle is 150°.

Wait, no, wait, the protractor: the horizontal line is 0°, and the ray is at 150°? Wait, no, the angle is 150 degrees.

Answer:

150