Triangle ABC is an isosceles triangle

If the measure of B is 37 degrees what is the measure of C?
A.37
B.53
C.106
D.143
I think it's A or C?

Yep. It's either A or C. Is angle C a vertex or base angle?

http://library.thinkquest.org/20991/geo/ietri.html

Angle B is the vertex.

So does that mean C is the base angle and the correct answer is A?

Yes.

Triangle GHI is an isosceles triangle.

H is the vertex.
If the measure of H is 73 degrees what is the measure of G?
A.73
B.17
C.34
D.104
A)73 degrees?

To determine the measure of angle C in an isosceles triangle ABC, where angle B is already known to be 37 degrees, we need to use the property of isosceles triangles which states that the base angles (angles opposite the congruent sides) are equal.

Since triangle ABC is isosceles, angle B and angle C are congruent. Therefore, the measure of angle C is also 37 degrees.

Therefore, the answer is A. 37 degrees.