Question

Is a equilateral triangle and a right triangle similar?

And

Is a right triangle and a isosceles triangle similar?

Answer 1

An equilateral triangle cannot be similar to a right triangle, whereas an isosceles triangle can be similar to a right triangle.

Explanation:

A right triangle must have a 90º angle, so it cannot be equilateral in side length and angle since the figure would no longer be a triangle.

Isosceles triangles have two same sides, so two equal angles. A right triangle can be a 45º, 45º, and 90º.