since the base of the refraction cup is a half circle how can you find the radius, what is the radius.

Radius is one of the important parts of a circle. It is the distance between the center of the circle to any point on its boundary. In other words, when we connect the center of a circle to any point on its circumference using a straight line, that line segment is the radius of that circle. A circle can have more than one radius because there are infinite points on its circumference. This means that a circle has an infinite number of radii and all the radii of the circle are equidistant from the center of the circle. The size of the circle changes when the length of the radius varies.

The radius of a circle can be found using the three basic radius formulas i.e., when the diameter, the area, or the circumference is known. Let us use these formulas to find the radius of a circle.

When the diameter is known, the formula is Radius = Diameter/ 2.
When the circumference is known, the formula is Radius = Circumference/2π.
When the area is known, the formula for the radius is Radius = ⎷(Area of the circle/π).

As, it is given that the base of the refraction cup is a half circle.

So, to find the radius of the circle we have to we have to half the base.

This is because the radius is half of the diameter.

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