Verified Answer :

AAn obtuse angle is less than 180 but greater than 90. So for examples sake I will use 179 degrees. 179 divided by 2 (as the angles are congruent) = 89.5 which is less than a right angle. Therefore, the angles will be acute.

Hope it helps :)
rube

the type of angle are those 2 congruent angles is
acute
so your answer is
a. acute
hope that helps