Semi Circle and Circle

What is the area of this circle?

• 6082.12

• 1519.76

• 1893.14

• 1292.92

What is the area of this circle?

• 8322.13

• 1134.11

• 4536.46

• 1267.09

Does this picture show the diameter or radius of a circle?

• Diameter

• Radius

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

• Radius

• Diameter

If a circle has a radius of 10 ft. then which statement is true?

• The radius is 5 ft. 

•  The diameter is 5 ft

• The radius is 20 ft.

• The diameter is 20 ft.

If a circle has a diameter of 16 ft. then which statement is true?

• The radius is 8 ft. 

•  The diameter is 8 ft

• The radius is 32 ft.

• The diameter is 32 ft.

What is the perimeter of the semi-circle?

• 11 yd

• 17.27 yd

• 34.54 yd

• 28.27 yd

what is the formula for finding radius

• c = π d

• c = 2 π r

• d = r/2

• r = d/2

Find the area of the circle

• 43.96

• 153.86

• 87.82

• 307.72

what is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm