Math Exam Revision

a circle has an arc with 90 degrees and the radius is 20m.find the arc length.

• 360

convert these numbers to radians.

40

100

80

12

a circle has an arc with 120 degrees and the radius is 3in. find the arc length.

• 180

a circle has a sector with 22.5 degrees and the radius is 24mm. Find the area of the sector.

a circle has a sector with 40 degrees and the radius is 1mm. Find the area of the sector.

write the equation of a circle if the center is (4,3) and the radius is 4.

• (2,3)

  (2,6)

  y=0

  x=2

• (3,2)

  (6,2)

  y=10

  x=4

• (4.6)

  (4,14)

  y=8

  x=16

• (2,8)

  (6,6)

  y=9

  x=3

the cross section of a cylender is:

• circle

• square

• triangle

• rectangle