Calculate the perimeter of a circle of radius 7 cm
The perimeter of a circle of radius 7 cm is 21.12 cm.
The perimeter of a circle of radius 7 cm can be calculated by multiplying the radius (7 cm) by 3.4, since the circumference of the circle is equal to pi times the radius squared. Therefore, the perimeter of the circle is 3.4 x 7 cm, which is equal to 24.8 cm.