If in each , the triangle is

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equilateral triangle

isosceles triangle

unequal triangle

right triangle

answer is B.

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Detailed Solution

Concept:
Here, we use the "law of cosines" to find the values of

and

from the theorem and assign them to the above question. The law of cosines uses this theorem because it associates all three sides of a triangle with the angle of the triangle. The description shows a combination of sides and angles. Therefore, it is easy to prove a given statement using this law.
Using Cosine formula,

Two sides of

are equal
So, triangle is isosceles triangle Hence, the correct option is 2) isosceles triangle

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