Circles - Unit 3 IM

Front

What is the formula for the area of a circle?

Back

A = πr², where A is the area and r is the radius.

Tags

CCSS.7.G.B.4

Front

If the area of a circle is 100π, what is the radius?

Back

The radius is 10.

Tags

CCSS.7.G.B.4

Front

What is the relationship between the radius and diameter of a circle?

Back

The diameter is twice the radius (d = 2r).

Front

If the radius of a circle is 6 cm, what is the area?

Back

A = π(6)² = 36π cm².

Tags

CCSS.7.G.B.4

Front

What is the formula for the circumference of a circle?

Back

C = 2πr, where C is the circumference and r is the radius.

Tags

CCSS.7.G.B.4

Front

If the area of a circle is 25π in², what is the diameter?

Back

The diameter is 10 in.

Tags

CCSS.7.G.B.4

Front

What is the radius of a circle with an area of 56.12 square feet?

Back

The radius is approximately 6.7 feet.

Tags

CCSS.7.G.B.4

Front

How do you find the area of a circle if you know the diameter?

Back

Use the formula A = π(d/2)².

Tags

CCSS.7.G.B.4

Front

What is the area of a circle with a radius of 4 inches?

Back

A = π(4)² = 16π in².

Tags

CCSS.7.G.B.4

Front

What is the radius of a circle if its circumference is 12π?

Back

The radius is 6.

Tags

CCSS.7.G.B.4