Classify the triangle.
A. equilateral
B. scalene
C. isosceles

Step-by-step explanation:

An isosceles triangle is a triangle with (at least) two equal sides.

In the figure given, the two equal sides have length of 12, and the remaining side has length 11. .

This property is equivalent to two angles of the triangle being equal.

An isosceles triangle therefore has both two equal sides and two equal angles.