(a) Yes, the angles marked with yellow are equal.

Are the angles marked with yellow equal ans?

Ans. The angle marked in yellow is same as the one marked in red. All angles of the hexagon are same as the angle marked in green. All angles of the octagon are same as the angle marked in black.

What is right angle 5th?

Definition of Right Angle

A right angle comes into existence when two straight lines intersect each other at 90 degrees. Furthermore, in a right angle, two straight lines are perpendicular to each other at the intersection. The representation of the right triangle is by the symbol ∟.