Area and Circumference of circles

If my diameter is 19 inches, what is my radius?

• 38 inches
• 9.5 inches
• 59.66 inches
• 119.32 inches

If my radius is 10ft, what is my diameter?

• 20ft
• 5ft
• 31.4ft
• 62.8ft

what is the circumference of this circle ?

• 3.14 cm 
• 37.68 cm
• 24 cm
• 68.4 cm

What is the formula for area of a circle?

• A = pi x D
• A = 2pi x r
• A = pi x r2
• A = pi x D2

What is the radius of this circle?

• 12
• 6
• 24

What is the area of this circle?

• 163.2
• 15.3
• 124.2
• 113.1

What is the area of this circle?

• 1385.44
• 2142.12
• 5541.77
• 1289.12

Find the circumference of a circle with a radius of 12.5 mm .

• 37.68mm
• 18.84mm
• 78.5mm
• none of the above

What is the formula for finding the circumference for a circle with just the radius?

• 2*π*r

• 1/2 b*h

• a+b/2*h

• I do not know

What is the area of this circle?

• 1385.44
• 2142.12
• 5541.77
• 1289.12