1. classify the triangle by its sides
a.) acute
b.) scalene
c.) isosceles
d.) equilateral

2. find the missing angle measure
a.) 35 degrees
b.) 40 degrees
c.) 45 degrees
d.) 50 degrees

3. which value could be the length of the missing side of the triangle not drawn to scale
a.) 5
b.) 7
c.) 17
d.) 12

The first one is isosceles because it has two side lengths that are the same, C.
The missing angle measure is 35° because all of them together should add up to 180° and 105+40+35=180, A.
The possible lengths for the third triangle e are in between 7, and 17. This is because the possible side lengths are in between adding the two side lengths together, (12+5=17) and subtracting the littler side by the bigger side. (12-5=7)