Question

An angle is shown.



image


Which answer choice shows how a protractor should be positioned to measure the angle and gives the correct angle measure?



A.
39
°

image


B.
54
°

image


C.
126
°
image


D.
141
°

image

Answer 1

I can’t see the images you’re referring to. Could you either upload the picture of the angle with the four answer choices, or describe how the angle is drawn (which ray is horizontal/vertical and which direction it opens)?

Meanwhile, here’s how to place and read a protractor so you (or I, once you upload the image) can pick the correct answer:

1. Put the protractor’s center hole exactly on the angle’s vertex.
2. Line up the protractor’s baseline (the straight edge with the 0) with one ray of the angle. Make sure the 0 on the protractor is on the ray you chose.
3. Look at where the other ray crosses the numbered scale. Use the scale that starts at the 0 you aligned — many protractors have two sets of numbers (0→180 from the right and 0→180 from the left); pick the numbers that start at the baseline.
4. That crossing number is the angle measure. If the crossing number is greater than 90 it’s obtuse; less than 90 it’s acute.

If you upload the image (or describe the orientation: which side is horizontal and whether the angle opens up/down/left/right), I’ll mark the correct placement and give the correct measure and answer choice.