Circles, Area, and Scale Review

The definition of radius is

• distance from one point to another point

• distance around the circle

• distance from the center to any point on the circle

• distance across the circle through the center

The definition of diameter is

• distance from the center of any point on the circle

• distance across the circle through the center

• distance from one point to another

• distance around the circle

The definition of circumference is

• distance from the center of any point on the circle

• distance from one point to another

• distance around the circle

• distance from the center of any point on the circle

what is the formula for finding diameter

• r = 2 d

• d = 2 r

• a = m c²

• c = π 2 r

what is the formula for finding radius

• c = π d

• c = 2 π r

• d = r/2

• r = d/2

what is the formula for finding circumference

select ALL that apply

• c = π d

• c = 2 π r

• d = 2 r

• r = d/2

find the area of the circle with radius 3 cm below.

• 100 cm²
• 225 cm²
• 9 cm²
• 28.26 cm²

Find the circumference of a circle with
radius = 100 cm

• 628.3 cm
• 31.42 cm
• 314.2 cm
• 310 cm

Find the circumference of a circle with
diameter = 0.5 ft

• 3.1 ft
• 1.6 ft
• 16 ft
• 2 ft

Find the circumference of a circle with diameter = 30 ft

• 942 ft
• 94.2 ft
• 188.5 ft
• 9.42 ft