Question

what is the measurement of this angle?

Explanation:

Step1: Identify the protractor scale

The protractor has two scales, but the horizontal ray is along the 0° (or 180°) mark, and the other ray is between 80° and 100° on the upper scale, closer to 90°.

Step2: Read the angle

Looking at the upper scale (where 0° is on the right for the horizontal ray), the angle between the two rays is 90°? Wait, no, wait. Wait, the horizontal ray is along the 180°/0° line (the right side, 0°), and the other ray is at 90°? Wait, no, the protractor: the bottom ray is along the 0° (right) to 180° (left) line? Wait, no, the standard protractor: one ray is along the 0° (horizontal right), and the other ray is measured from that. The upper scale: when the horizontal ray is at 0° (right), the angle is measured by the upper numbers. Wait, the arrow is at 90? Wait, the protractor's markings: the vertical arrow is at the 90° mark? Wait, the numbers: the upper scale has 0 - 180 from left to right? No, wait, the protractor in the image: the bottom ray is horizontal to the right (180° mark? No, the right end is 0°/180°? Wait, no, the protractor's center is at the vertex. The bottom ray is along the 0° (right) to 180° (left) line. The other ray is at 90°? Wait, the markings: the upper scale (the one with 80, 90, 100) – the ray is at 90°? Wait, no, let's check: the horizontal ray is along the 0° (right) direction, and the other ray is at 90° from it, so the angle is 90 degrees? Wait, no, wait the protractor's numbers: the upper scale, when the horizontal ray is at 0° (right), the angle is measured by the upper numbers. The ray is at 90°? Wait, the arrow is pointing at the 90° mark? Wait, the protractor has 80, 90, 100 – the ray is between 80 and 100, at 90? Wait, the angle between the two rays (horizontal and the other) is 90 degrees? Wait, no, maybe I misread. Wait, the horizontal ray is along the 180° (left) to 0° (right) line. The other ray is at 90° from the horizontal (right) ray, so the angle is 90 degrees? Wait, no, the protractor's markings: the upper scale, when the horizontal ray is at 0° (right), the angle is measured by the upper numbers. The ray is at 90°? Wait, the answer is 90 degrees? Wait, no, wait the protractor: the bottom ray is horizontal to the right (0°), and the other ray is at 90°, so the angle is 90°.

Wait, maybe I made a mistake. Let's look again: the protractor has two scales. The outer scale (upper) goes from 0 to 180 from left to right? No, the standard protractor: when you have a horizontal ray to the right (0°), the angle is measured by the upper scale (0 - 180 counterclockwise) or lower scale (0 - 180 clockwise). In this case, the horizontal ray is to the right (0°), and the other ray is going up, at 90°, so the angle is 90 degrees.

Answer:

90 degrees