Answer:
1. D
2. B
3. A
4. C
Explanation:
1. The third side can't be calculated with given information
2. This is right triangle so you can use Pythagorean theorem to find hypotenuse.
6^2 + 8^2 = c^2
36 + 64 = c^2
100 = c^2
10 = c = PR
Since PM = RM, you would take half of c to find PM. So PM = 5
3. When writing congruency statement, you have to be careful with orders.
Angle A is congruent to angle E.
Angle B is congruent to angle D
So if A comes first, then E should be written first for the other side (does that make sense?)
4. For SAS, you need 2 congruent sides and 1 congruent angle. But that angle has to be in between two congruent sides.