= 12? ×3. 14÷6

=75.36

12.56×6=75.36 60 degrees is one sixth of a circle 1 The circumference of a circle is 75.36.

75.36÷3. 14÷2= 12 is the radius.

12? ×3. 14=452. 16 is the area of the circle.

452. 16÷6 =75.36 is the sector area.

Two (8/2)? ×3. 14-2? ×3. 14 The reduced area is equal to the area of this CD.

=4? ×3. 14-2? ×3. 14

=50.24- 12.56

=37.68