Naming Triangles Based on Angles

Q.

In $△$ABC, $\angle$ABC = 90${}^{\circ }$, $\angle$BAC = 45${}^{\circ }$ and $\angle$ACB = 45${}^{\circ }$. What is this triangle called?

1. 90^o triangle

2. Right angled triangle

3. Isosceles triangle

4. Right angled Isosceles triangle

Q.

In $△$ABC, ∠ABC = 90${}^{\circ }$, ∠BAC = 45${}^{\circ }$ and ∠ACB = 45${}^{\circ }$. What is this triangle called?

1. Right angled triangle

2. Isosceles triangle

3. 90${}^{\circ }$ triangle

4. Right angled Isosceles triangle

Q.

An obtuse-angled triangle is one in which all the angles are less than 90°. State true or false.

1. True
2. False