Area of Circles

A circle with a 12 inch diameter is folded in half and then folded in half again. What is the area of the resulting shape?

• 150.72 in²

• 113.04 in²

• 28.26 in²

• 18.84 in²

The face of a clock has a circumference of 63 in. What is the area of the face of the clock? 

• 21 

• 32.97

• 110.25

• 346.19

Which of these pairs of quantities are proportional to each other?

• Radius and diameter of a circle

• Radius and circumference of a circle

• Radius and area of a circle

• Diameter and circumference of a circle

• Diameter and area of a circle

Find the area of this shape.

• 10 m²

• 12 m²

• 14 m²

Each square has a side length of 12 units. Compare the areas of the shaded regions in the 3 figures. Which figure has the largest shaded region?

• 
• 
• 
• all of the above

 $What\ is\ the\ area,\ in\ terms\ of\ \pi,\ ofa\ circle\ with\ a\ radius\ of\ 10?$  

•  $10\pi$  

•  $20\pi$  

•  $100\pi$  

 $What\ is\ the\ area,\ in\ terms\ of\ \pi,\ ofa\ circle\ with\ a\ diameter\ of\ 10?$  

•  $5\pi$  

•  $25\pi$  

•  $20\pi$  

 $What\ is\ the\ area,in\ terms\ of\pi,\ ofa\ half-circle\ with\ a\ diameter\ of\ 10?$  

•  $12.5\pi$  

•  $25\pi$  

•  $30\pi$