Answer
Not a right triangle.
Work Step by Step
The given sidelengths form a right triangle if they satisfy the Pythagorean Theorem formula $c^2=a^2+b^2$ where $c$ is the longest side (hypotenuses).
Substitute all the values into the formula:
$(7)^2=(5)^2+(4)^2$
$49=25+16$
$49=41$
The sides are not equal.
Hence, the side lengths do not represent a right triangle.
