In mathematics (and more specifically geometry), a semicircle is **a one-dimensional locus of points that forms half of a circle**. The full arc of a semicircle always measures 180° (equivalently, π radians, or a half-turn). It has only one line of symmetry (reflection symmetry).

Contents

- 1 Is semicircle a geometric shape?
- 2 How do you describe a semicircle?
- 3 What does a semi circle look like?
- 4 What shape is half a circle?
- 5 What is quarter circle?
- 6 How do you name a semicircle in geometry?
- 7 How do you write the semicircle of a circle?
- 8 Does a semi circle have right angles?
- 9 How many semi circles are in a circle?
- 10 Does a semicircle have corners?

## Is semicircle a geometric shape?

In mathematics (more specifically geometry), a semicircle is a two-dimensional geometric shape that forms half of a circle. Being half of a circle’s 360°, the arc of a semicircle always measures 180°. A triangle inscribed in a semicircle is always a right triangle.

## How do you describe a semicircle?

A semicircle is a half circle, formed by cutting a whole circle along a diameter line, as shown above. Any diameter of a circle cuts it into two equal semicircles. * An alternative definition is that it is an open arc. See note at end of page.

## What does a semi circle look like?

A semicircle is one half of a circle. It looks like a straight line with a circular arc connecting its ends to one another. The straight edge of the semicircle is the diameter and the arc is half the circumference of a full circle with the same diameter.

## What shape is half a circle?

In mathematics (and more specifically geometry), a semicircle is a one-dimensional locus of points that forms half of a circle. The full arc of a semicircle always measures 180° (equivalently, π radians, or a half-turn).

## What is quarter circle?

The area (or) portion that is formed by two radii that are perpendicular to each other and one-fourth portion of the circumference of a circle is known as a quarter circle. This is also known as a quadrant of a circle. i.e., if we divide a circle into 4 equal parts, each part is a quarter circle (or) a quadrant.

## How do you name a semicircle in geometry?

Semicircle: an arc whose endpoints are the endpoints of a diameter. It is named using three points. The first and third points are the endpoints of the diameter, and the middle point is any point of the arc between the endpoints.

## How do you write the semicircle of a circle?

In the case of a circle, the formula for area, A, is A = pi * r^2, where r is the circle’s radius. Since we know that a semicircle is half of a circle, we can simply divide that equation by two to calculate the area of a semicircle. So, the formula for the area of a semicircle is A = pi * r^2/2.

## Does a semi circle have right angles?

The angle at the circumference in a semicircle is a right angle.

## How many semi circles are in a circle?

The diameter is twice the radius of a circle. This is shown below. In the above figure, we can see that AD is the diameter that divides the circle into 2 equal parts which we call semicircles. Hence, there are 2 semicircles in a circle.

## Does a semicircle have corners?

There are 2 square corners in a semi circle.