Question

in a circle of diameter 21 CM, two separate circles, each with diameter 7 CM are drawn. the region outside the smaller circles is to be painted yellow while the two inner circles are painted red. find the area to be painted yellow

Answer 1

Area to be painted with yellow=
$\pi( {10.5}^{2} - 2 \times ( {3.5)}^{2} ) = 269.5 \\ sq \: cm$

Answer 2

Answer:

Step-by-step explanation:

Area of the circle= πr sq.

= 22/7 × 21 × 21 = 1386

Area of smaller circles =

22/7 × 7 × 7= 154

Area of two equal circles= 154 × 2

= 308

Area of yellow region = 1386-308

= 1078 cm sq. (Ans.)