To determine to measure of the unknown angle, be sure to use the total sum of 180°. If two angles are given, add them together and then subtract from 180°. If two angles are the same and unknown, subtract the known angle from 180° and then divide by 2.
Perimeter= (2 x Length) + (2 x width) Do to find width: Width= perimeter - (2 x length) So now substitute in an equation W= 154 - (55 x 2) W= 154-110= 44 Remember 44 would equal the width when it is multiplied by 2. Now you have to divide by 2 to get the original.
