# Math surface area problem?

0 votes
Using pi=3.14 find the surface area of the cylindrical cake, excluding its base.

The hight is 12 inches and the diameter is 30 inches and the radius is 15 inches
asked May 3, 2013

## 2 Answers

0 votes

The cylinder cake height     : h = 12 inches

The cylinder cake diameter : d = 30 inches

The cylinder cake radius     : r = 15 inches

The surface area of the cylinder cake : A = 2π×r2 + 2π×r×h

A = 2π×r(r + h)

Substitute π = 3.14 , h = 12 , r = 15 in the above formula

There fore A = 2(3.14)(15)(15 + 12)

Simplify

A = 30(3.14)(27)

A = 2543.4sq.inches

answered May 3, 2013

A = 1836.9 squre inches.

0 votes

The cylindrical cake height = 12 inches

cylindrical cake diameter : d = 30 inches

cylindrical cake radius = 15 inches.

In this case surface area of the cylinder cake : A = (area of top) + (perimeter of top )* height

A = π r2 + 2 π r h

A = 3.14 (15)2 + 2(3.14)(15)(12)

A = 706.5 + 1130.4

A = 1836.9 squre inches.

answered Jul 14, 2014