Question

The perimeter of a rectangle is four more than the area of the rectangle. Find the area of the rectangle, if its width is 1 cm.

What is the surface area of a cylinder that has a volume of 785.4 in^3 and a radius of 5 in?

Answer 1

Let x = height
Area = x*1 = x
Perimeter = 2x + 2*1 = 2x + 2
Perimeter = Area + 4
so 2x + 2 = x + 4
2x - x = 4 - 2
x = 2
Therefore, height = 2cm
Therefore, Area = 2*1 = 2cm^2

Answer 2

the choices of the first one are : 0.5 cm^3, 2cm^3, 8cm^3, 1cm^3

Answer 3

area(circular side) = pi*5^2 = 25pi
V = area(circular side) * length
therefore, length = V/area(circular side)
= 785.4/25pi
= 10
S.A. (Surface Area) = 2*area(circular side) + area(length side)
= 2*25pi + length*circumference
= 50pi + 10*2pi*5
= 50pi + 100pi
= 150pi in^2
= 471.2 in^2

Answer 4

ahh my bad pheonix is right....

Answer 5

is the first one 2cm^3?

Answer 6

no...if its area..then it is sq cm or cm^2

Answer 7

ok. Thanks