Question

Find the lateral surface area of the triangular prism. Refer to your STAAR 8th Grade Math Reference Sheet for the appropriate formula.90 in2110 in2120 in2130 in2

Answer 1

The Solution:

Given:

Required:

To find the lateral surface area of the above triangular prism.

Step 1:

Definition.

So, applying the above formula, we have:

`Lateral\text{ Surface Area=\lparen a+b+c\rparen h}`

In this case,

`\begin{gathered} a=5\text{ in.} \\ b=12\text{ in.} \\ c=13\text{ in.} \\ h=4\text{ in.} \end{gathered}`

Substituting these values in the formula, we get

`Lateral\text{ surface Area=\lparen5+12+13\rparen4=30}*4=120\text{ in.}^2`

Therefore, the correct answer is 120 square in. [option 3]