How can a shape have parallel sides but not perpendicular lines?

Mr switzer needs to buy new 1-foot tiles to cover his bathroom floor. the floor is 12 feet long and 8 feet wide. each square foot of tile will cost $1.79. in dollars what will be the total cost of the tiles he needs to buy.

How many $20 bills do you need to have to make $280

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?