Question

If the sides of a triangle are $\text{39 cm, 80 cm, and 89 cm}$, then the triangle formed is a right-angled triangle.

• A. Right-angled
• B. Obtuse-angled

Answer 1

The correct option is A

Right-angled

Applying pythagorean property to the given three sides,

${39}^2+{80}^2={89}^2$
$1521+6400=7921$
$7921=7921$

Thus, $(39,80,89)$ satisfies the Pythagorean property. Hence, the triangle formed by them is an right-angled triangle.