Circle Formula

Which formula can be used to find the length of the secants in the diagram?

• a∙b=c∙d

• outside∙whole=outside∙whole

• angle = 1/2(arc + arc)

• angle = 1/2(big - small)

Tags

CCSS.HSG.C.A.2

What is the formula for circumference of a circle given the diameter?

• C = π r

• C = 2 π r

• C = π d

• C = 2 π d

Tags

CCSS.7.G.B.4

Which formula would help you solve the following problem: A circle has a diameter of 7.6 feet. What is the circumference of the circle in feet?

Tags

CCSS.7.G.B.4

What two formulas can you use to find the circumference?

• C = π·d

• C = π·r²

• C = 2·π·r

• C = d²

Tags

CCSS.7.G.B.4

The radius of the circle is 9 meters.  What is the circle's circumference?

• 9 meters

• 28.26 meters

• 56.52 meters

• 18 meters

Tags

CCSS.7.G.B.4

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

• 100 cm²

• 225 cm²

• 9 cm²

• 28.26 cm²

Tags

CCSS.7.G.B.4

A circular swimming pool is 21 feet in diameter. Which formula below will help you determine the circumference of the pool?

Tags

CCSS.7.G.B.4

Determine the formula needed to solve the following question:

Chloe has a round pillow with a diameter of 17 in. What is the area of her pillow?

Tags

CCSS.7.G.B.4

The distance around a circle is

• Circumference

• Radius

• Center

• Central Angle

Tags

CCSS.HSG.C.A.2

The distance from a circle to its center

• Chord

• Central angle

• circumference

• radius