Question

question 19 of 45
which of the following is an acute triangle?
a. triangle b
b. triangle a
c. triangle d
d. triangle c

Explanation:

Step1: Recall acute - triangle definition

An acute - triangle has all angles less than 90°.

Step2: Analyze Triangle A

In Triangle A, the angles are 70°, 55°, and 55°. Since 70° < 90°, 55° < 90°, and 55° < 90°, it is an acute - triangle.

Step3: Analyze Triangle B

In Triangle B, one angle is 125° which is greater than 90°, so it is not an acute - triangle.

Step4: Analyze Triangle C

In Triangle C, one angle is 90°, so it is a right - triangle, not an acute - triangle.

Step5: Analyze Triangle D

In Triangle D, one angle is 132° which is greater than 90°, so it is not an acute - triangle.

Answer:

B. Triangle A