Question

1. are the triangles below acute, obtuse, or right?

triangle a
triangle b
triangle c
triangle d

acute
obtuse
right
acute
obtuse
right
acute
obtuse
right
acute
obtuse
right

Explanation:

Triangle A

Step1: Recall triangle type definitions

• Acute: All angles < 90°.
• Obtuse: One angle > 90°.
• Right: One angle = 90°.

Step2: Check Triangle A's angles

Angles: 50°, 50°, 80°. All < 90°.

Step1: Recall triangle type definitions

• Acute: All angles < 90°.
• Obtuse: One angle > 90°.
• Right: One angle = 90°.

Step2: Check Triangle B's angles

Has a 90° angle (right angle symbol).

Step1: Recall triangle type definitions

• Acute: All angles < 90°.
• Obtuse: One angle > 90°.
• Right: One angle = 90°.

Step2: Check Triangle C's angles

Has a 90° angle (right angle symbol).

Answer:

Acute

Triangle B