1.7 Triangles Homework
1. Find the lengths of the sides of △RST 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