Final answer:
To find the circumference of a circle, use the formula C = 2πr, where C is the circumference and r is the radius. Calculate the circumference for each circle by substituting the given radius into the formula. The circumferences are 44(22/7) cm, 14(22/7) in, 80(22/7) mi, and 30(22/7) yd.
Step-by-step explanation:
Circle Circumference
To find the circumference of a circle, we use the formula C = 2πr, where C is the circumference and r is the radius of the circle.
Let's find the circumference for each circle:
- a) For a circle with a radius of 22 cm, the circumference is C = 2(22/7)(22) = 44(22/7) cm.
- b) For a circle with a radius of 7 in, the circumference is C = 2(22/7)(7) = 14(22/7) in.
- c) For a circle with a radius of 40 mi, the circumference is C = 2(22/7)(40) = 80(22/7) mi.
- d) For a circle with a radius of 15 yd, the circumference is C = 2(22/7)(15) = 30(22/7) yd.
Therefore, the circumferences of the given circles are:
a) 44(22/7) cm
b) 14(22/7) in
c) 80(22/7) mi
d) 30(22/7) yd