The half of a circle; the part of a circle bounded by its diameter and half of its circumference.

Leg openings (30) in the shape of semi-circles are provided.

Since a semicircle is one half of a circle, the circumference of a semicircle is half the circumference of a circle.

Since a semicircle is one half of a circle, the circumference of a semicircle is half the circumference of a circle.

Because a semicircle is half of a circle, the area of the semicircle is half of the area of the circle.

Measure the distance across the semicircle to find the diameter of the semicircle.

On the semi-circle of the plane there is a plain protractor scale and in the centre of the semi-circle there is a longshaped groove running perpendicularly to the diameter.

For example, a yellow circle represents the sun, while a yellow half-circle represents Half Moon.

The view can be a circle, a halfcircle or a quadrant of a circle.

The view can be a circle, a halfcircle or a quadrant of a circle.

It looks like one single semicircle; one large semicircle and a smaller one on either side.

Only half the circle showed when we rolled it as a complete circle.

It looks like one single semicircle; one large semicircle and a smaller one on either side.

The inner carriage can be formed in varying shapes such as a sphere, hemisphere, semicircle or a circle.

The concavity of the concave ring is a quarter of a semicircle.