Question

plz ans my question ..............

Answer 1

hope this will help u

sorry for the error ..
the area of bigger circle should be halfed as it is semi circle ..sorry mate

Answer 2

From diagram (attached above )

Radius of larger semi circle (C1) = (20 + 14)/2
= 17 cm

Radius of smaller semi circle (C2) = 10 cm (20/2)


Radius of smallest semi circle (C3) = 7 cm



Then Sum of area of all semi circle = area of given diagram


Area of semicircle C1

= $\frac{\pi r^2}{2}$

$\frac{ \frac{22}{7} \times {17}^{2} }{2} \\ \\ = \frac{3179}{7} \: {cm}^{2}$


Now are of semicircle C2

$= \frac{\pi {r}^{2} }{2} \\ \\ = \frac{ \frac{22}{7} \times {10}^{2} }{2} \\ \\ = \frac{1100}{7} \: {cm}^{2}$

Now area of semicircle C3

$= \frac{\pi {r}^{2} }{2} \\ \\ = \frac{ \frac{22}{7} \times {7}^{2} }{2} \\ \\ = \frac{539}{7} \: {cm}^{2}$

Now sum of all

$= \frac{3179}{7} + \frac{1100}{7} + \frac{539}{7} \\ \\ = \frac{4818}{7} \: {cm}^{2} \\ \\ or \: = \: 688.285 \: {cm}^{2}$

Hope it helps