Center

Sector

Radius

Central Angle

Arc

Diameter

Sector

Radius

Chord

Arc

Radius

Central Angle

Sector

Center

Arc

The distance around a circle.

The space inside the circle.

The length of the straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

The line from the center of a circle to any point on its edge.

 $2\pi r$  

 $\pi d$  

 $2\pi r^2$  

 $\pi r^2$  

The distance around a circle.

The space inside the circle.

The length of the straight line segment that passes through the center of the circle and whose endpoints lie on the circle.

The line from the center of a circle to any point on its edge.

 $2\pi r$  

 $\pi d$  

 $2\pi r^2$  

 $\pi r^2$  

452.39 cm²

139.12 cm²

113.1 cm²

84.23 cm²

87.82in

153.86in

43.96in

307.72in