Area of Circles

Which of the following names a radius?

• segment AC

• segment DB

• segment AB

• segement BC

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

• Radius

• Diameter

What is the radius of this circle?

• 12cm

• 6cm

• 24cm

• 3cm

Which of the following names a diameter?

• segment AC

• segment DB

• segment AB

• segment BC

Which segment is the diameter?

• AC

• BD

• LM

• CE

The radius is....

• a line that crosses through the center and touches each edge 

• the center point of a circle 

• a line from the center point to the edge of the circle

• an element in science

what is the formula for finding area of a circle

• C = π r²

• A = π r²

• A = π r² / 2

• C = 2 π r

Find the radius of the circle

• 20 ft

• 10 ft

• 5.5 ft

• 10

find the radius of the circle

• 3 m

• 1.5 m

• 1.5

• 1.5 mm

what is the formula for finding the area of a semi-circle

• A = π r²

• C = π r²

• A = π r² / 2

• A = 2 π r