Area, Circumference, Arc length, Area of a sector

 $\pi r^2$  is the formula for 

• Area of a circle

• Area of a sector

• Circumference of a circle

• Arc Length

 $2\pi r^{ }$  is the formula for 

• Area of a circle

• Area of a sector

• Circumference of a circle

• Arc Length

 $\frac{Degree}{360}\cdot2\pi r$  is the formula for 

• Area of a circle

• Area of a sector

• Circumference of a circle

• Arc Length

 $\frac{Degree}{360}\cdot\pi r^2$  is the formula for 

• Area of a circle

• Area of a sector

• Circumference of a circle

• Arc Length

The exact area of a circle with a radius of 15cm is A=_______ $\pi$  square cm.

The area of a circle is 19.63 m². Find the radius. Round to the nearest tenth.

r = ______ meters.

Find the radius of a circle with a circumference of $18\pi$ 

• r = 36 units

• r =18 units

• r =6 units

• r =9 units

Find the circumference of the circle as an exact answer.

• 20π meters

• 40π meters

• 400π meters

• 314π meters

Find the exact area of the sector created by the 45^o arc (leave in terms of π).

• 2π ft²

• 6.28π ft²

• 4π ft²

• 12.56π ft²

Find the approximate area of the red sector bounded by arc DE.  Found to the nearest hundredth (make sure to use the  $\pi$  button on the calculator).
Area of the sector = ____________ square inches.