Question

Which of the following is an acute triangle?
70
30*
24°
45
126
132
36°
90°
45
559 55°
Triangle A
Triangle B
Triangle C
Triangle D
A. Triangle B
B. Triangle A
O
C. Triangle C
O.
D. Triangle D

Answer 1

Triangle A.
The angle is less that 90 degrees.

Answer 2

The correct answer will be option (B) Triangle A

Acute triangle

An acute-angled triangle is a type of in which all the three internal angles of the triangle are acute, that is, they measure less than 90°

How to solve this problem?

The steps are as follow:

• In acute triangle the the internal angle should not or greater than 90 degree
• In triangle B one of internal angle is 126 degree which is greater than 90 degree so it is not acute triangle
• One internal angle of triangle C is 90 degree so it is also not acute triangle
• For triangle D one angle is 132 degree which is greater than 90 degree so it also not acute triangle
• In triangle A all the internal angle is less than 90 degree so it is acute triangle

So the triangle A is acute triangle

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