Suppose a triangle has 3,4, and 5 sides. Which of the following must be true?

Option B (triangle is right angle triangle

Step-by-step explanation:

Given

sides are 3,4,5

By the Pythagoras theorem

So sum of the square of two sides =square of the third side

3^2+4^2=5^2

9+16=25

25=25

L.H.S=R.H.S

So it follows the Pythagoras theorem it proved it is a right angle triangle.