Question

introduction to quadrilateral of class 9​

Answer 1

Step-by-step explanation:

In Euclidean plane geometry, a quadrilateral is a polygon with four edges (sides) and four vertices (corners). Sometimes, the term quadrangle is used, by analogy with triangle, and sometimes tetragon for consistency with pentagon (5-sided) and hexagon (6-sided), or 4-gon for consistency with k-gons for arbitrary values of k.

The word "quadrilateral" is derived from the Latin words quadri, a variant of four, and latus, meaning "side".

Quadrilaterals are simple (not self-intersecting) or complex (self-intersecting), also called crossed. Simple quadrilaterals are either convex or concave.

The interior angles of a simple (and planar) quadrilateral ABCD add up to 360 degrees of arc, that is

{\displaystyle \angle A+\angle B+\angle C+\angle D=360^{\circ }.}\angle A+\angle B+\angle C+\angle D=360^{\circ }.

This is a special case of the n-gon interior angle sum formula (n − 2) × 180°.

All non-self-crossing quadrilaterals tile the plane by repeated rotation around the midpoints of their edges.

Answer 2

Answer:

HERE IS YOUR ANSWER

...

Step-by-step explanation:

Quadrilateral is a polygon which has four sides and four vertices.

There are many types of quadrilateral. These are :-

1. Rectangle

2. Square

3. Rombus ,etc...

HOPE THAT THIS WILL HELP YOU...........