Find the perimeter of a semicircle of radius 7 cm.

Find the perimeter of a circle of radius 7cm.

Find the perimeter (in cm) of semicircle of radius 28 cm.

Find the area and the perimeter of the semicircle whose radius is 14 cm.

PQ is a diameter of a semicircle with radius 7.5 cm. and anglePQR is the angle on the semicircle. If PR = 9cm. Then the length of QR is

If the perimeter of a semicircle is 72 cm, then find its area (in cm^(2) ).

The perimeter of sector of a circle of radius 7cm and central angle 45^@ is