Circles are everywhere in our daily lives, from the wheels on our cars to the clocks on our walls. This quiz will challenge your understanding of these fascinating shapes, their properties, and their applications. Dive in and see how well you know your circles!

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## Intro to Circles Quiz Questions Overview

### 1. What is the formula for the circumference of a circle?

2πr

πr^2

r^2/2

πd

### 2. What is the area of a circle with a radius of 5 units?

25π

10π

5π

50π

### 3. What is the diameter of a circle?

The distance around the circle

Twice the radius

Half the radius

The area of the circle

### 4. Which of the following is a property of all circles?

All radii are equal

All diameters are different

All chords are equal

All angles are right angles

### 5. What is the length of an arc with a central angle of 60 degrees in a circle with a radius of 10 units?

10π

5π/3

10π/3

5π

### 6. What is the term for a line segment that goes from one point on a circle to another point on the circle, passing through the center?

Chord

Radius

Diameter

Tangent

### 7. What do you call a line that touches a circle at exactly one point?

Chord

Radius

Diameter

Tangent

### 8. If the radius of a circle is doubled, how does the area change?

It doubles

It quadruples

It remains the same

It triples

### 9. What is the name of the longest chord in a circle?

Radius

Diameter

Secant

Tangent

### 10. What is the measure of an angle inscribed in a semicircle?

45 degrees

60 degrees

90 degrees

180 degrees

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