Area of a Circle

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

• radius

• olna

• diameter

• sector

Answer explanation

Tags

CCSS.4.G.A.1

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

• radius

• subtractus

• abacus

• diameter

Answer explanation

Tags

CCSS.HSG.C.A.2

CCSS.HSG.CO.A.1

CCSS.HSG.GPE.A.1

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.

Tags

CCSS.6.RP.A.1

CCSS.6.RP.A.3

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.

Tags

CCSS.7.G.B.4

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.

Tags

CCSS.7.G.B.4

A circle with diameter 12 feet has a radius of....

• 2 feet

• 4 feet

• 6 feet

• 8 feet

Answer explanation

$d=2r$

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

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

Tags

CCSS.7.G.B.4

A circle with radius 4 mm has a diameter of...

• 2 mm

• 4 mm

• 6 mm

• 8 mm

Answer explanation

$d=2r$

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

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

Tags

CCSS.7.G.B.4

To find the area of a circle, simply multiply $\pi$ by the radius squared.

• True

• Not True

Answer explanation

 $A\ =\ \pi r^2$  
The area of a circle is found by multiplying  $\pi$  by the radius squared.

Tags

CCSS.HSG.GMD.A.1

Is it possible to find the area of a circle if given the diameter?

• Yes, radius is half the diameter

• No, diameter and radius are totally unrelated

Answer explanation

$A=\pi r^2$
The area of a circle is found by multiplying $\pi$ by the radius squared.

Tags

CCSS.HSG.GMD.A.1

What is the area of a circle with a radius of 7?

• $\pi$

• $7\pi$

• $14\pi$

• $49\pi$

Answer explanation

$A=\pi r^2$

The area of a circle is found by multiplying $\pi$ by the radius squared.

Tags

CCSS.HSG.GMD.A.1