It is a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).

It is a straight line passing from side to side through the center of a body or figure, especially a circle or sphere.

It is a part of a curve, especially a part of the circumference of a circle.

It is a part of a figure cut off by a line or plane intersecting it, in particular.

It is a straight line joining the ends of an arc.

It is a line segment whose end points are points on a circle.

It is a straight line that cuts a curve in two or more parts.

It is the outside edge of an area or object that is round or curved, or the length of this edge.

It is the plane figure enclosed by two radii of a circle or ellipse and the arc between them.

It is a straight line or plane that touches a curve or curved surface at a point, but if extended does not cross it at that point.

It is the point that is equally distant from every point on the circumference of a circle.

The father of radius in the story.

They came to save Radius and Lady Di.

The gift given to Radius for more discoveries.

Who turned into a dragon?

The name of the potion given by Radius to his father.

How many/much spoonful of the new potion to be given for the father to become human again?

What will happen to the father if the measurement of the new potion to be given is wrong?

If d = 10 cm, what is the circumference of the circle?

If r = 5 ft, what is the circumference of the circle?

If y = 9x, and x = 5, what is y?

The mother of Radius.

If y = x - 5 and x = -15, what is the value of y?

In y = 2x + 5, x is known as