John is moving up to the attic and wants to paint one wall blue the wall is a triangle with a base of 21 feet and a height of 8 feet what is the area of the wall to be painted
The formula for the area of a triangle is:
A = 1/2 x base x height
In this case, the base is 21 feet and the height is 8 feet. So, we can plug these values into the formula:
A = 1/2 x 21 x 8
A = 84 square feet
Therefore, the area of the wall to be painted is 84 square feet.