10.4b Area and Circumference of Circles

10.4b Area and Circumference

Finite Math

EQ: Wednesday, November 16, 2023

• How do I find the area and circumference of a circle?

Multiple Choice

A circle is

• a set of all points in a plane that are the same distance from a center point

• the distance around a share

• a round figure with no straight sides

• the earth, a basketball, a bubble, or a watermelon

Match

Match the following

• radius

• diameter

• circumference

• $$\pi$$

dist. from center to any pt. on circle

distance across circle through center

distance around a circle

circumference divided by the diameter

• dist. from center to any pt. on circle

• distance across circle through center

• distance around a circle

• circumference divided by the diameter

​A circle is the set of all points that are the same distance from a point called the center.

The diameter is the distance across the circle through the center.

The radius is the distance from the center to any point on the circle.

The circumference is the distance around a circle.

What is 𝜋 ?

ℿ ℼ
P p

​The sixteenth letter of the Greek alphabet.

​The symbol used to represent the ratio of the circumference of a circle to its diameter.

Circles

Area = interior space

Circumference = Perimeter

diameter, d

radius, r

​d = 2r r = d/2

Math Response

Give the diameter of the circle in feet.

Type answer here

Correct Answer: 23.8

Deg^°

Rad

Math Response

Give the radius of the circle in centimeters.

Type answer here

Correct Answer: 4.3

Deg^°

Rad

Multiple Choice

Give the circumference of the circle. Use 3.14 for the value of π.

• 628 feet

• 31.4 feet

• 62.8 feet

• 19.9 feet

Multiple Choice

Give the circumference of the circle. Use 3.14 for the value of π.

• 55.9 in

• 61.6 in

• 62.2 in

• 28 in

Math Response

Give the circumference of the circle. Use 3.14 for the value of π. Round your answer to the nearest tenth.

Type answer here

Correct Answer: 43.3

Deg^°

Rad

Math Response

Give the circumference of the circle. Use 3.14 for the value of π. Round your answer to the nearest tenth.

Type answer here

Correct Answer: 29.5

Deg^°

Rad

Math Response

Give the circumference of the circle with a radius of 6.7 feet. Use 3.14 for the value of π. Round your answer to the nearest tenth.

Type answer here

Correct Answer: 42.1

Deg^°

Rad

Math Response

Give the circumference of the circle with a diameter of 22 cm. Use 3.14 for the value of π. Round your answer to the nearest tenth.

Type answer here

Correct Answer: 69.1

Deg^°

Rad

Multiple Choice

Find the area of the circle. Use 3.14 for the value of π.

• 379.9 cm^2

• 45963.1 cm^2

• 34.5 cm^2

• 95 cm^2

Multiple Choice

Find the area of the circle. Use 3.14 for the value of π.

• 78.5 cm^2

• 98.5 cm^2

• 102 cm^2

• 113 cm^2

Math Response

Find the area of the circle with a radius of 5 cm. Use 3.14 for the value of π. Round your answer to the nearest tenth.

Type answer here

Correct Answer: 78.5

Deg^°

Rad

Math Response

Find the area of the circle with a diameter of 24 m. Use 3.14 for the value of π. Round your answer to the nearest tenth.

Type answer here

Correct Answer: 452.2

Deg^°

Rad