Question

find the area of the Ring whose outer and inner radii are respectively 23 cm and 12 CM

Answer 1

let the outer ring radii be R and inner radii r.

area of ring = π(R sq. - r sq.)

π(23 sq. - 12 sq.)

22/7 (529-144)
22/7 × 385
22×55
$= 1210 {cm}^{2}$

Answer 2

Answer:

1209.67

Step-by-step explanation:

Area of the ring = Area of outer ring - area of inner ring

Area of outer ring :

3.142 × 23 × 23 = 1662.118

Area of inner ring :

3.142 × 12 × 12 = 452.448

Area of the ring is :

1662.118 - 452.448 = 1209.67

= 1209.67 square centimeters