Question

Find the area of shaded portion

Answer 1

Answer:

Step-by-step explanation:FIRST YOU NEED TO KNOW THE FORMULA OF AREA OF CIRCLE i.e. π*r*r

Area of bigger part

(which is. a quarter

of a circle therefore

it's area will be

one-fourth of it)

=1/4*(π*28*28)

=616sq.cm

Area of small part

(same that is written

in first bracket). =1/4(π*21*21)

=346.5sq.cm

Therefore,

Area of shaded

portion =area of bigger part - area of smaller part

=616-346.5=269.5 sq.cm

Answer 2

Answer:

Step-by-step explanation:

let R=28cm

let r=21cm

we know that area of quad= πr^2/4

so area of shaded portion=(πR^2/4)-πr^2/4

=π/4(R²-r²)

=π/4(28²-21²)

=π/4(784-441)

=π/4(343)

=11*49/2

=539/2 =269.5