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It's an isosceles triangle. an isosceles triangle has two congruent sides that have the same measures and the third side can be whatever measure. Those 2 congruent sides are called "legs"
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Since the lengths of two sides of the triangle are both 15 inches and the third side measures 10 inches, then the triangle is: An isosceles triangle.

A triangle can be defined as a two-dimensional shape that comprises three (3) sides, three (3) vertices and three (3) angles.

This ultimately implies that, any polygon with three (3) lengths of sides is a triangle.

In Geometry, there are three (3) main types of triangle based on the length of their sides and these are;

  • Equilateral triangle.
  • Scalene triangle.
  • Isosceles triangle.

An isosceles triangle has two (2) congruent sides that are equal in length and two (2) equal angles while the third side has a different length.

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