What is the type of this triangle?

Call the 2 equal angles has a magnitude of $a^{\text{o}}$ . So the third angle has the magnitude of $2a^{\text{o}}$ . Also the sum of the interior angles of a triangle is $\text{180}^{\text{o}}$ . So $a^{\text{o}}+a^{\text{o}}+2a^{\text{o}}=\text{180}^{\text{o}}$ $\iff 4a^{\text{o}}=\text{180}^{\text{o}}$ $\iff a^{\text{o}}=\bigg (\frac{180}{4} \bigg )^{\text{o}}=45^{\text{o}}$ $\iff 2a^{\text{o}}=(45 \times 2)^{\text{o}}=90^{\text{o}}$ Cause it has a right angle (the third one) so the answer is $\Large \boxed{It~is~a~right~angled~triangle}$

45º,45º,90º