Respuesta :

Answer:

D

Step-by-step explanation:

since IS = IM then Δ SIM is isosceles with the 2 base angles being congruent , then

∠ M = ∠ S = 78°

sqdancefan

Answer:

  D. 78°

Step-by-step explanation:

In the given isosceles triangle, the congruent base angles are ∠S and ∠M. If the measure of angle S is 78°, then the measure of angle M is 78°.

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