# What is a 4 sided triangle called?

## What is a 4 sided triangle called?

tetrahedron

In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners.

**What do the angles equal in a 4 sided shape?**

Every quadrilateral has 4 sides, 4 vertices, and 4 angles. 4. The total measure of all the four interior angles of a quadrilateral is always equal to 360 degrees. The sum of interior angles of a quadrilateral fits the formula of polygon i.e.

### Does a kite have a right angle?

Thus the right kite is a convex quadrilateral and has two opposite right angles. If there are exactly two right angles, each must be between sides of different lengths. All right kites are bicentric quadrilaterals (quadrilaterals with both a circumcircle and an incircle), since all kites have an incircle.

**How do you find the third side of a triangle if two sides are known?**

To use the Law of Sines to find a third side:

- Identify angle C. It is the angle whose measure you know.
- Identify a and b as the sides that are not across from angle C.
- Substitute the values into the Law of Cosines.
- Solve the equation for the missing side.

#### What do you call a four sided figure?

Four-sided. Four sided figures are called quadrilaterals . A quadrilateral with opposite sides equal and parallel is called a parallelogram. The corresponding solid is called a parallelepiped . A parallelogram, with all its angles right angles is called a rectangle. The solid version of the rectangle is called a cuboid .

**What kind of shape is a triangle with 3 sides?**

Triangles are just shapes with 3 (straight) sides. They can be big or small and can look somewhat different. Depending on the angles and the sides we can sort the triangles into different types. The simplest way to sort triangles is by their angle size:

## What do you call a quadrilateral with four sides?

Four sided figures are called quadrilaterals . A quadrilateral with opposite sides equal and parallel is called a parallelogram. The corresponding solid is called a parallelepiped . A parallelogram, with all its angles right angles is called a rectangle.

**How to find the angles in a triangle?**

There are several ways to find the angles in a triangle, depending on what is given: Use the formulas transformed from the law of cosines: If the angle is between the given sides, you can directly use the law of cosines to find the unknown third side, and then use the formulas above to find the missing angles, e.g. given a,b,γ: