What is the measure of f?

An isosceles triangle is one with two equal-length sides. The measure of ∠F in the ΔFGH will be equal to 65°. The correct option is B.
A triangle is a three-edged polygon with three vertices.
An isosceles triangle is one with two equal-length sides. It is sometimes stated as having exactly two equal-length sides, and sometimes as having at least two equal-length sides, with the latter form containing the equilateral triangle as a particular case.
In the given triangle, ΔGHF, the length of the two sides HG and HF are equal. Therefore, the given triangle can be considered an isosceles triangle.
Now, since in an isosceles triangle the angle between the base side and the congruent side is the same, therefore, we can write,
∠HFG = ∠HGF = 65°
∠HFG = 65°
Hence, the measure of ∠F in the ΔFGH will be equal to 65°.
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