Posted by **aleasha** on Sunday, January 23, 2011 at 2:58pm.

i know the formula of a rectangles surface area is SA= 2(lw)+(wh)+(lh), but when the dimensions are : 2a for the height, a for the width, and 3a for the length, how do i solve?

- math (surface area) -
**MathMate**, Sunday, January 23, 2011 at 3:02pm
Put l=3a, w=a, h=2a

into your formula to get

S = 2(lw+wh+lh)

= 2(3a*a + a*2a + 3a*2a)

= 2(11a²)

= 22a²

Check my work.

Bote: The parentheses in your formula have been misplaced. The correct form is:

S=2(lw+wh+lh)

## Answer This Question

## Related Questions

- Math - Find the surface area of rectangular pyramids 1. Length= 1.15ft Width=0....
- math - Recognize that rectangles that have the same area can have different ...
- algebra - sooo confusing... 6. (ΒΌ + 7/8)(9/13) A81/13 B17/104 C81/104 D17/29 E17...
- geometry - The lateral area of a prism is 144cm^2 (lateral area is surface area ...
- Geometry - What is the lateral surface area of the prism? Rectangular prism ...
- MATH-Stuck - For each of the following, the Surface Area is given. Calculate the...
- math( surface area) - write a product that represents the surface area of any ...
- Math - A rectangular prism has a volume of 960cm. It's width, length, and ...
- Math - Three rectangles have exactly the same area. The dimensions of each ...
- math - Three rectangles have exactly the same area. The dimensions of each ...

More Related Questions