What is the value of x if triangle ABC is equilateral?
Pick two sides to set equal to each other and solve.
1/2
2
What is the measure of angle 4
Angle 4 is an exterior angle, so add the 60 and 40.
100
120
Set 16x+5=85 and solve.
6
5
You already have an angle congruent to an angle and a side congruent to a side, so what else would you need to know is congruent so that you have another angle?