Circles/Semi-Circles

What is the area of this circle? (use 3.14 for  $\pi$  ).

• 15393.8  $mi^2$  

• 3846.5  $mi^2$  

• 5930.12  $mi^2$  

• 1248.12  $mi^2$  

What is the area of a circle with the diameter of 10cm ?

• 66cm
• 78.5cm
• 66.5cm
• 10m

What is the area of this semi circle? 

• 100.5 square cm
• 25.1  square cm
• 50.3 square cm
• 12.6 square cm

The definition of circumference is

• distance from the center of any point on the circle

• distance from one point to another

• distance around the circle

• distance from the center of any point on the circle

What is the area of this semicircle ? (d = 8 cm) 

• 100.48 cm²
• 80 cm²
• 200.96 cm²
• 25.12 cm²