If you have an angle whose vertex is the center of a circle that means the sides are the radius or radii. Does it also mean that the sides of the angle are the same?

Anyone know these questions? i need ,.

What is the probably of getting heads when poing a coin and getting a number greater than or equal to 5 when rolling a single diea) 1/6b) 1/3c) 1/4d) 1/12

A50-foot ladder is leaning against a vertical wall. if the base of the ladder is 45 feet from the base of the wall, find the angle the bottling of the ladder makes with the ground.