Triangular fun

Geometry Level 2

Consider a triangle with vertices $A, B$ and $C$ such that the two of the interior angles are $\angle A = 20^{\circ}$ and $\angle B = 10^{\circ}$ .

What kind of triangle is it?

Equilateral Its actually an oblate spheroid Right There is no such triangle A four sided triangle Scalene None of these Isosceles