SOLUTION: mary is making a poster which will include 84 triangular pieces of colored construction paper, if each triangle has a base of 14cm and a height of 7 cm , how many square meters of

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: mary is making a poster which will include 84 triangular pieces of colored construction paper, if each triangle has a base of 14cm and a height of 7 cm , how many square meters of       Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 1028641: mary is making a poster which will include 84 triangular pieces of colored construction paper, if each triangle has a base of 14cm and a height of 7 cm , how many square meters of colored paper will she need?
Answer by fractalier(6550) About Me  (Show Source):
You can put this solution on YOUR website!
The area of a triangle is given by
A+=+%281%2F2%29bh
so each triangle has an area of
A = (1/2)(14)(7) = 49 sq cm
84 of them would need an area of 84 x 49 = 4116 sq cm.
But there are 100^2 = 10000 sq cm in a square meter...
Thus you would need 0.4116 square meters colored paper.