Circles

Question 1

What is the formula for the circumference of a circle?

Answer 1

2xπxr or πxd

Question 2

What is the formula for the area of a circle?

Answer 2

πxr squared

Question 3

What is the formula for the length of the arc of a sector?

Answer 3

(θ/360) × 2πr

Question 4

What is the formula for the circumference of a sector?

Answer 4

r+r+ (θ/360) × 2πr

Question 5

What is the formula for the area of a sector?

Answer 5

(θ/360) × πr²

Question 6

The line’s length through the centre touches two points on the edge of the circle.

Answer 6

Diameter

Question 7

The distance from the centre of a circle to any point on the boundary

Answer 7

Radius

Question 8

The perimeter of a circle

Answer 8

Circumfrence

Question 9

A portion of the perimeter of a circle.

Answer 9

Arc

Question 10

The line segment joining any two points on the circumference of the circle.

Answer 10

Chord

Question 11

A region bounded by a chord and a corresponding arc that is shaded.

Answer 11

Segment

Question 12

A shaded quarter of a circle

Answer 12

Quadrant

Question 13

A part of a circle made of the arc of the circle along with its two radii.

Answer 13

Sector

Question 14

The line that touches the outside of a circle at only one point.

Answer 14

Tangent

Question 15

How to find the radius of the circle if the area is given

Answer 15

√A/π

Question 16

How to find the radius if circumference is given

Answer 16

C/2π