Question

solve only highlighted ones​

Answer 1

Hey

here is ur ans for Q.43

Radius of circles (From smaller to bigger) = 3 , 4 , 12 & 13

area of inner shaded region = area of smaller circle =

$\pi \ \: r ^{2}$

= 3. 14 * 3 * 3

= 28. 26 cm^2

area of second shaded region = area of 13cm radius circle - area of 12cm radius circle

=

$\pi( r1 ^{2} - r2 ^{2} )$

= 3. 14 ( 13*13 - 12*12)

= 3. 14 ( 169 - 144)

= 3. 14 * 25

= 78. 5