Questions: Classify the following triangle as scalene, isosceles, or equilateral by the lengths of its three sides: 5 mm, 17 mm, 17 mm.

Solution Steps

The given side lengths of the triangle are 5 mm, 17 mm, and 17 mm.

• A scalene triangle has all sides of different lengths.
• An isosceles triangle has at least two sides of equal length.
• An equilateral triangle has all three sides of equal length.

Since the triangle has two sides of equal length (17 mm and 17 mm), it is an isosceles triangle.

Final Answer