Circles

Find the circumference of the circle whose radius is 4 in

• 12.56 in

• 25.12 in

• 50.24 in

Find the circumference of the circle

• 50.24 yd

• 25.12 yd

• 11.14 yd

Find the circumference.

• 72.12ft

• 69.08ft

• 67.34ft

• 12.32ft

Find the area of the circle

• 43.96
• 153.86
• 87.82
• 307.72

find the area of the circle below.

• 100 cm
• 225 cm
• 9 cm
• 28.26 cm

The distance across the middle of a circle is called....

• radius

• olna

• diameter

• sector

Answer explanation

The distance from the center of a circle to the edge of a circle is the....

• radius

• subtractus

• abacus

• diameter

Answer explanation

The diameter is how many times larger than the radius.

• The same size

• Twice as big

• Three times as big

• Four times larger

Answer explanation

$diameter\ =\ 2\left(radius\right)$ $radius\ =\ \frac{1}{2}\left(diameter\right)$

Radius is half way across, Diameter is the whole way across.

A circle with diameter 16 feet has a radius of....

• 4 feet

• 8 feet

• 8 inches

• 32 inches

Answer explanation

$d=2r$

$r=\frac{1}{2}d$

Radius is half way across, Diameter is the whole way across.

A circle with radius 18 cm has a diameter of...

• 18 cm

• 32 cm

• 36 cm

• 74 cm

Answer explanation

$d=2r$

$r=\frac{1}{2}d$

Radius is half way across, Diameter is the whole way across.