Circles - Circumference and Area

Which is the formula used to find the circumference of a circle?

• C = πd

• C = πr

• C = πr²

• C = 2πd

Which is the formula used to find the area of a circle?

• A = πd

• A = πr

• A = πr²

• A = 2πr

Tags

CCSS.HSG.GMD.A.1

What is the circumference of a circle with a radius of 15 cm? Use 3.14 for pi.

• 94.2 cm

• 47.1 cm

• 706.5 cm

• 2826 cm

Tags

CCSS.7.G.B.4

What is the circumference of a circle with a diameter of 15 cm? Use 3.14 for pi.

• 47.1 cm

• 94.2 cm

• 23.55 am

• 706.5 cm

Tags

CCSS.7.G.B.4

What is the area of a circle with a radius of 15 cm? Use 3.14 for pi.

• 706.5 cm²

• 176.625 cm²

• 2826 cm²

• 94.2 cm²

Tags

CCSS.7.G.B.4

CCSS.7.G.B.6

What is the area of a circle with a diameter of 15 cm? Use 3.14 for pi.

• 706.5 cm²

• 47.1 cm²

• 176.625 cm²

• 94.2 cm²

Tags

CCSS.7.G.B.4

CCSS.7.G.B.6

What is the diameter of a circle with a radius of 15 cm?

• 15 cm

• 30 cm

• 7.5 cm

• 225 cm

Tags

CCSS.7.G.B.4

What is the radius of a circle with a diameter of 15 cm?

• 7.5 cm

• 15 cm

• 30 cm

• 225 cm

Tags

CCSS.7.G.B.4

If I am trying to figure out how much ribbon to put around a circular frame, I need the​ ____.​ ​ ​

• circumference

• area

Tags

CCSS.7.G.B.4

If I am trying to figure out how much space is inside a circular frame, I need the ____.

• circumference

• area

Tags

CCSS.HSG.GMD.A.1