Question

A pond 100 feet in diameter is surrounded by a circular grass walk which is 2 feet wide .The number of square feet of grass on the walk is

a. 4 pi
b. 20 pi
c. 196 pi
d. 204pi
e. 270 pi

please answer and explain

Answer 1

figure the area of the pond
Add 2 to the radius and figure the new area
subtract the smaller from the larger.

Answer 2

smaller area

a=pi r^2
= pi 50^2
= 2500 pi

larger area

a=pi r^2
=pi 52 ^2
=2704 pi

2704-2500
=204

answer d

thank you