## Algebra 1: Common Core (15th Edition)

One angle is 4 times the other so one of the angles is 4x: Angle A=4x Angle B=c Angle C=90 The angles in a triangle are equal to 180 degrees so add all the angles and set them equal to 180: 180=4x+x+90 180=5x+90 90=5x 18=x B is 18 degrees and since A is 4 times B, you multiply 18 $\times$4=72.So A is 72 degrees