Supplementary angles will always add up to 180. Vertical angles are always opposite to each other. If <1 is 90, then <2 is also 90. since 4 is opposite of that, it will also be <90
<span>Triangle PQR is similar to triangle TSR because measure of angle 3 equals measure of angle 4 and measure of angle 1 equals measure of angle 5</span>
