Friday 10/16/09

Homework for periods 3,4,6
Finish the 8 equations that were on the board. Show the steps and tell me the answers.

Homework for periods 2,7
Find alternate forms of the formulae.

For Trapezoid: A=½(b₁ + b₂) x H

If you distribute the ½ and the H to the parenthesis, the equation becomes

A = ½b₁H + ½b₂H

Then, solving for b₁, you subtract ½b₂H from each side to get:

A - ½b₂H = ½b₁H

To get rid of the ½, mulitply both sides by 2 to get

2(a - ½b₂H) = b₁H

divide both sides by H to get:

2(a - ½b₂H)/H = b₁