# Math Help - Lateral Area and Total Surface Area

1. ## Lateral Area and Total Surface Area

Ok, when I'm trying to find these two areas of a prism, I will sometimes get the question wrong. My teacher told us LA= Perimeter times height, and TSA= LA+ 2 times the area of the base or "2B". Sometimes I'll get the question wrong because I don't put 1/2 before the Area. Is there a specific time when you are suppossed to divide by 2, or is it all the time?

2. Originally Posted by Itachi888Uchiha
Ok, when I'm trying to find these two areas of a prism, I will sometimes get the question wrong. My teacher told us LA= Perimeter times height, and TSA= LA+ 2 times the area of the base or "2B". Sometimes I'll get the question wrong because I don't put 1/2 before the Area. Is there a specific time when you are suppossed to divide by 2, or is it all the time?
when the base of ther prism is a triangle ... the area of a triangle is $\frac{1}{2}bh$