Question

what type of special triangle is this?

Explanation:

A right - angled triangle with angles \(30^{\circ}\), \(60^{\circ}\), and \(90^{\circ}\) is a \(30^{\circ}-60^{\circ}-90^{\circ}\) triangle. An obtuse triangle has one angle greater than \(90^{\circ}\), which is not the case here. An isosceles triangle has two equal angles (and sides), which is not shown. A \(45^{\circ}-45^{\circ}-90^{\circ}\) triangle has two \(45^{\circ}\) angles, which is also not the case.

Answer:

\(30^{\circ}-60^{\circ}-90^{\circ}\)