Area and Perimeter of Circle

The perimeters of the two circles are in the ratio 2 : 3.  The ratio of their areas is ___

• 4 : 9

• 2 : 3

• 7 : 9

• 4 : 10

If the perimeter and the area of a circle are numerically equal, then the radius of the circle is

• 2 Units

• 4 Units

• 3 Units

• 7 Units

The perimeter of square circumscribing circle of radius 'a' cm is

• 8a cm

• 6a cm

• 10a cm

• 16a cm

The distance around a circle

• area

• diameter

• circumference

• radius

Find the arc length.  Leave your answer in terms of π.

• 7/4π

• 7/2π

• 1/8π

• 45π

Area of a sector of central angle 120° of a circle is 3π cm². Then the length of the corresponding arc of this sector is:

• 5.8 cm

• 6.1 cm

• 6.3 cm

• 6.8 cm

What is the area of the shaded region?

• 25π - 50

• 25π - 100

• 5π - 50

• 5π - 100

Find the area of the shaded sector of circle O. The radius is 6 inches and the central angle is 100°. Express answer to the nearest tenth of a square inch.( Use Pi =3.14)

• 25.2 in²

• 28.5 in²

• 31.4 in²

• 38.2 in²

• a

• b

• c

• d

In the diagram, three tangents circumscribe a circle. Find the perimeter of the triangle.

• 48.8

• 47.4

• 39.8

• 36.4