Question

find three cards that match. right equilateral obtuse scalene

Explanation:

Step1: Analyze red triangle

An equilateral triangle has three equal sides and three equal angles (each \(60^{\circ}\)). The red triangle has all sides equal in length (visually and by definition of equilateral).

Step2: Analyze green triangle

An obtuse triangle has one angle greater than \(90^{\circ}\). A scalene triangle has all sides of different lengths. The green triangle has one angle \(> 90^{\circ}\) (obtuse) and all sides of different lengths (scalene).

Answer:

Red triangle: equilateral; Green triangle: obtuse, scalene