1.7 Triangles Homework 1. Find the lengths of the sides of â–³RST and classify the triangle by its sides. R(− 1,− 3), S(4, 4), T (8,− 1) RS=sqrt74 ST=sqrt41 TR=sqrt85 scalene triangle Find the measure of each indicated angle. Then classify the triangle by the angles. 2. 3. =122 obtuse triangle acute triangle 4. =116 5. obtuse triangle =45 =60 equalraderal triangle Solve for x . 6. 7. 180=25x+80 100=25x 4=x 30x+60=180 30x=120 x=4 8. 9. 9x-2=70 9x=72 x=8 70 40 70 96=7x+5 91=7x 13=x