Brandon is painting a 28 ft by 18 ft rectangular wall in an office. find the area of the wall. how many gallons of paint must be purchased to paint two coats on the wall if one gallon of paint covers 400 square feet?

1. ∠1 is complementary to ∠2 and ∠3 is complementary to ∠2. subtraction property of equality 2. m∠1 + m∠2 = 90 and m∠3 + m∠2 = 90 substitution 3. m∠1 + m∠2 = m∠3 + m∠2 definition of complementary 4. m∠1 = m∠3 given