Answer:
3. acute
Explanation:
The triangle is an acute angle as all its measures are less than (<) 90°.
89° < 90°
78° < 90°
13° < 90°
=》Triangle → c. acute
acute triangle
For an acute, the angles should be less than 90°
right should be equal to 90°
obtuse, angles should be less than 180 but greater than 90
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