SOLUTION: What is the area in square units of an isosceles triangle with a base that is 8 units long and side lengths 5 units long?

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Question 841098: What is the area in square units of an isosceles triangle with a base that is 8 units long and side lengths 5 units long?
Found 2 solutions by Fombitz, ewatrrr:
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
Use the base and leg length to calculate the altitude using Pythagorean theorem.
%288%2F2%29%5E2%2Bx%5E2=5%5E2
16%2Bx%5E2=25
x%5E2=9
x=3
For a triangle,
A=%281%2F2%29bh=%281%2F2%29%288%29%283%29=12

Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
 

Hi,

isosceles triangle with a base that is 8 units long and side lengths 5 units long?



Applying Pythagorean Theoerm

 h = sqrt%2825-%288%2F2%29%5E2%29+=+3

height = 3 units 

 A = %281%2F2%29bh+=+%281%2F2%29%288%29%283%29+=+12units%5E2+