Question

classify each triangle by angles and by sides. word bank by angles: acute, equiangular, obtuse, right by sides: equilateral, isosceles, scalene

Explanation:

Step1: Analyze first triangle

All angles are 60° and all sides are 8.6. By angle - definition (3 congruent angles), it's equiangular. By side - definition (3 congruent sides), it's equilateral.

Step2: Analyze second triangle

One angle is 128° (greater than 90°), so it's obtuse by angle - definition. Two sides are 2.5, so it's isosceles by side - definition.

Step3: Analyze third triangle

All angles are less than 90° (72°, 72°, 36°), so it's acute by angle - definition. Two sides are 4.8, so it's isosceles by side - definition.

Step4: Analyze fourth triangle

One angle is a right - angle (90°), so it's right by angle - definition. Two sides are congruent (marked with same symbol), so it's isosceles by side - definition.

Step5: Analyze fifth triangle

One angle is a right - angle (90°), so it's right by angle - definition. Two sides are congruent (marked with same symbol), so it's isosceles by side - definition.

Answer:

1. Equiangular, Equilateral
2. Obtuse, Isosceles
3. Acute, Isosceles
4. Right, Isosceles
5. Right, Isosceles