Question

A triangle is having sides 3cm, 4cm, 5cm in length. The greatest angle of this triangle is ___ .

• A. ${180}^{\circ }$
• B. ${90}^{\circ }$
• C. ${45}^{\circ }$
• D. ${100}^{\circ }$

Answer 1

The correct option is B

${90}^{\circ }$

Given, sides of a triangle are 3cm,4cm and 5cm.

$3^2+4^2=9+16$

= 25

= $5^2$

The sides of this triangle follow Pythagoras theorem. So, this is a right-angled triangle.

So, the greatest angle is ${90}^{\circ }$.