Question

The area enclosed by the circumferences of two concentric circle is 346.5 cm³. If the circumference of the inner circle is 88 cm, calculate the radius of the outer circle.

(a) 16.5 cm (b) 18 cm (c) 17.5 cm (d) 18 cm

Answer 1

Answer:

17.5cm

see the attachment...,...

Answer 2

Step-by-step explanation:

area enclosed= 346.5 cm2

radius of inner be r

radius of outer be R

given, 2πr = 88

r = 44/π

so....area of inner = πr^2 = 1936/π

area of bigger = inner + ring = 962.747 cm2

or......... πR^2 = 962.747

R= 17.5 cm

so...... c) is correct