Question

Hi:) is angle BAC a right angled triangle?

Answer 1

no because then the a^2+b^2=c^2 formula would apply, with 7 (the longest side) being the hypotenuse. and when substituting a b and c for the values of 3, 6, and 7 respectively you get an invalid equation!

Answer 2

no, its not

Explanation:

it does not have an angle of 90°

It is a scalene triangle