#### Answer

Right Triangle

#### Work Step by Step

Using the Pythagorean Theorem...
$a^{2}+b^{2}=c^{2}$
$1.5^{2}+2^{2}=2.5^{2}$
Simplify...
$2.25+4=6.25$
$6.25=6.25$
Since the sum of the sides squared $(6.25)$ is equal to the hypotenuse squared $(6.25)$, the triangle is a right triangle.