Question

Just help me please......

Answer 1

1.

radius: 10

diameter: 20

2.

radius: 25

diameter: 50

3.

radius: 7

diameter: 14

Explanation:

1. Given: A= 100π ft²

the formula to find the area is: A= π · r²

to find the radius we will have to reverse the formula R =
`\sqrt{ (A)/(\pi)}`

now we have:

R =
`\sqrt{ (100\pi )/(\pi)}`

R =
`√( 100)`

R =
`10`

the radius is 10 since the radius is
`(1)/(2)` the diameter we will say:

2 · r

2 · 10 = 20

2. Given: A= 625π in²

the formula to find the area is: A= π · r²

to find the radius we will have to reverse the formula R =
`\sqrt{ (A)/(\pi)}`

now we have:

R =
`\sqrt{ (625\pi )/(\pi)}`

R =
`√(625 )`

R =
`25`

the radius is 25 since the radius is
`(1)/(2)` the diameter we will say:

2 · r

2 · 25 = 50

3. Given: A= 49π yd²

the formula to find the area is: A= π · r²

to find the radius we will have to reverse the formula R =
`\sqrt{ (A)/(\pi)}`

now we have:

R =
`\sqrt{ (49\pi )/(\pi)}`

R =
`√(49)`

R =
`7`

the radius is 7 since the radius is
`(1)/(2)` the diameter we will say:

2 · r

2 · 7 = 14

=D hope this helps