Question

what is the area of a circular ring with outer and inner radii as r1 and r2respectively​

Answer 1

Answer:

Area of outer ring = pier1²

Area of inner ring = pier2²

Answer 2

Answer:

Step-by-step explanation:

area of a circle=  πr²

for 1st circle

area = π r1²

for second circle

area = π r2²

area of ring = outer area - inner area

= πr1² -π r2²

= π (r1 -r2)²