Question

Three sides of a triangle are 6 cm, 12 cm and 13 cm then

• A. all three angles are acute
• B. one angle is a right angle and others acute
• C. one angle is obtuse and others acute
• D. one angle is obtuse, one acute and one right angle

Answer 1

The correct option is A all three angles are acute

We know that,

longest side² < other side² + other side² then is acute.

The sides of the triangle are 6 cm, 12 cm and 13 cm.
Since, ${13}^2<6^2+{12}^2$
Thus, the triangle is an acute angled triangle.