Question

simply:
4. Find the area of shaded portion.
10cm 8cm-B
10cm
10cm
D
-18cm
C
Solve the following:​

Answer 1

Answer:

Sol. We have, r1 = 19 cm

r2 = 9 cm

∴ Circumference of circle-I = 2π r1 = 2π (19) cm

Circumference of circle-II = 2π r1 = 2π (19) cm

Sum of the circumferences of circle-I and circle-II

= 2π (19) + 2π (9) = 2π (19 + 9) cm = 2π (28) cm

Let R be the radius of the circle-III.

∴ Circumference of circle-III = 2π R

According to the condition,

2π R = 2π (28)

Thus, the radius of the new circle = 28 cm.✔️✔️