Question

The sides of certain triangles are given below. Determine which of them are right triangles. 

1.4 cm, 4.8 cm, 5 cm

Answer 1

For the given triangle to be right-angled, the sum of the two sides must be equal to the square of the third side.
Here, let the three sides of the triangle be a, b and c. 

A= 1.4 cm, b= 4.8 cm and c= 5 cm
Then, 

`a^2+b^2=(1.4)^2+(4.8)^2` 

`=1.96+23.04` 

=25 

`c^2=5^2` 

=25 

`a^2+b^2=c^2`  

Thus, the given triangle is right-angled.