Question

the diameter of the three circles in this figure are 21 cm , 14 cm and 7 cm . what is the are of the shaded portion​

Answer 1

Step-by-step explanation:

radius of bigger circle = 21/2 = 10.5 cm

area = pie r sq

= 3.14 * 10.5 * 10.5 cm sq

= 346.185 cm sq

radius of big circle. = 14/2 = 7 cm

area = pie r sq

= 22/7 *7 * 7

= 154 cm sq

radius of small circle = 7/2 = 3.5 cm

area = pie r sq

= 22/7 * 3.5 * 3.5

= 385 cm sq

therefore, area of shaded portion = 346.185 - ( 154+385 ) = 577.185 cm sq ans