Question

Find the area of circle x² + y² = 25.

Answer 1

The center of the circle is at (0,0) and, when x = 0, the circle points are at

y=−5

and

y=5

. So, the radius of the circle is r = 5.

The area of a circle is given by

πr2

. So, substituting

r=5

, one gets the answer:

25π

Answer 2

Answer:

Area of circle = 78.5 sq units

Step-by-step explanation:

Find the area of circle x² + y² = 25.

Equation of circle

(x-a)² + (y-b)² = r²

Comparing with x² + y² = 25.

a & b = 0

r = 5

r is radius so radius = 5 unit

Area of circle = π r²

π  = 3.14

=>Area of circle = 3.14 * 5²

=>Area of circle = 3.14 * 25

=> Area of circle = 78.5 sq units