Circles

Question 1

What is the definition of radius?

Answer 1

The distance from the center of the circle to the edge of the circle

Question 2

What is the definition of diameter?

Answer 2

The distance across the circle, going through the center.

Question 3

What is the definition of circumference?

Answer 3

The distance around a circle.

Question 4

How do you read this symbol out loud? π

Answer 4

Pi (sounds like “pie”)

Question 5

What is the approximate value of π?

Answer 5

3.14

Question 6

What does this symbol mean? =

Answer 6

Exactly equal to

Question 7

What does this symbol mean? ≈

Answer 7

approximately equal to

Question 8

5 is the ____ of the circle

Answer 8

radius

Question 9

5 is the ____ of the circle

Answer 9

Diameter

Question 10

Is segment AB a diameter?

Answer 10

No, it doesn’t go through the center

Question 11

What is the formula for area of a circle?

Answer 11

Question 12

What does r represent in the area formula?

Answer 12

radius

Question 13

What are the two formulas for circumference of a circle?

Answer 13

First formula: **C=2πr **
Second formula: C=πD

Question 14

What does an exponent of 2 mean?

Answer 14

Multiply the number by itself

Question 15

How do you find the radius if you already know the diameter?

Answer 15

Divide diameter by 2

Question 16

How do you find the diameter if you already know the radius?

Answer 16

Multiply radius by 2