Circles: Circumference and Area

What is circumference?

• The distance around a circle.

• The space inside the circle.

• The length of the straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

• The line from the center of a circle to any point on its edge.

Tags

CCSS.HSG.GMD.A.1

What is the area of a circle?

• The distance around a circle.

• The space inside the circle.

• The length of the straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

• The line from the center of a circle to any point on its edge.

Tags

CCSS.HSG.GMD.A.1

The formula for the circumference of a circle is...

• $C\ =\ \pi d$

• $C\ =\ \pi$

• $C\ =\ \pi r$

• $C\ =\pi r^2$

Tags

CCSS.HSG.GMD.A.1

The formula for finding the area of a circle is...

• $A\ =\ \pi d$

• $A\ =\ \pi$

• $A\ =\pi r$

• $A\ =\pi r^2$

Tags

CCSS.HSG.GMD.A.1

What is the diameter of this circle?

• 8cm

• 16cm

• 10cm

• 4cm

Tags

CCSS.7.G.B.4

What is the radius of this circle?

• 18in

• 36in

• 9in

• 6in

Tags

CCSS.HSG.C.A.2

Is the red line a radius or diameter of the circle?

• Radius
• Diameter

Tags

CCSS.HSG.C.A.2

Find the circumference of the circle

• 87.82in

• 153.86in

• 43.96in

• 307.72in

Tags

CCSS.HSG.GMD.A.1

Find the area of the circle

• 43.96 units²

• 153.86 units²

• 87.82 units²

• 307.72units²

Tags

CCSS.HSG.GMD.A.1

What is the area of this circle?

• 452.39 cm²

• 139.12 cm²

• 113.1 cm²

• 84.23 cm²

Tags

CCSS.HSG.GMD.A.1