Vocabulary

Radius from Diameter

Diameter from Radius

Circumference

Area of a Circle

A round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center)

A circle

How do you find the radius of a circle when given the diameter?

divide the diameter by 2

How do you find the diameter of a circle when given the radius?

multiply the radius times 2

What is the formula for finding the circumference of a circle?

What is the formula for finding area of a circle?

A straight line from the center to the circumference of a circle

Radius

What is the radius of a circle that has an 8-foot diameter?

4 ft.

What is the diameter of a circle with a radius of 5 inches?

10 inches

Find the circumference of this circle when pi=3

84 m.

Find the area of this circle when pi = 3

588 m.

A straight line passing from side to side through the center of a circle

Diameter

What is the radius of this circle?

6 cm.

What is the diameter of a circle with a radius of 100 feet?

200 ft.

What is the circumference of a circle with a radius of 6 inches when pi = 3.14?

37.68 inches

What is the area of a circle with a radius of 5.5 inches when pi = 3.14?

94.985 inches

the distance around the circle. It is the circle's perimeter

circumference

What is the radius of this circle?

3.1 mm

What is the diameter of this circle?

28 m

What is the circumference of this circle when pi = 3.14?

28.26 in.

What is the area of this circle when pi = 3.14?

28.26 in.

The amount of space inside the boundary of a flat (2-dimensional) object such as a triangle or circle

Area

What is the radius of a circle that has a 325-foot diameter?

162.5 ft.

What is the diameter of a circle with a radius of 215 inches?

430 in.

What is the circumference of this circle when pi = 3.14?

19.468 mm

What is the area of this circle when pi = 3.14?

30.1754 mm

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