Area & Circumference of Circles Part 2

what is the circumference of this circle ?

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

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

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

If you are given the diameter, how can you calculate the radius?

• Multiply the diameter by 2
• Divide the diameter by 2
• Add 2 to the diameter
• Subtract 2 from the diameter

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

What is the radius of this circle?

• 20
• 10
• 40

What is the area of this circle?

• 1256.64
• 31.41
• 314.16
• 123.12

What is the area of this circle?

• 6082.12
• 1520.53
• 1893.14
• 1292.92

What is the area of this circle?

• 15393.8
• 1248.12
• 5930.12
• 3848.45

what is the formula for finding diameter

• r = 2 d

• d = 2 r

• a = m c²

• c = π 2 r