Question

Question 1 (d)

Name the type of the following triangle:

$\Delta DEF$ with $\angle D={90}^{\circ }$

Answer 1

A triangle with one angle as a right angle (${90}^{\circ }$) is known as a Right-angled triangle.
Hence the triangle ($\Delta DEF$) with $\angle D={90}^{\circ }$ will be a right-angled triangle.