Answer:
mAngleT = 60°
mAngleU = 60°
TS = 13cm
SU = 13cm
Explanation:
Since two of the sides are the same the two base angles are also the same. One is 60° so the other one is 60° also. But if they are both 60° and all the angles add up to 180° the last one has to be 60° also.
One side is marked 13cm. It is marked congruent to the left side so they are both 13cm.
But we saw from the angles all being the same, that this is actually an equilateral triangle. So all three sides are the same.