Question 732060
Geometry is {{{all}}} {{{about}}} {{{shapes}}} and their {{{properties}}}. 

Geometry can be divided into: 

{{{Plane}}}{{{ Geometry}}}- which is about flat shapes like lines, circles and triangles, shapes that can be drawn on a piece of paper

{{{Solid }}}{{{Geometry}}} - which is about three dimensional objects like cubes, prisms and pyramids

{{{Point}}}, {{{Line}}}, {{{Plane}}} and {{{Solid}}}- terms whose definitions you need to know

A {{{Point}}}- has no dimensions, only position
A {{{Line}}} -is one-dimensional
A {{{Plane}}} -is two dimensional (2D)
A {{{Solid}}} -is three-dimensional (3D)


There are many special {{{symbols}}} used in geometry. The most common geometrical symbols are:

symbol for triangle {{{DELTA}}},  for angle <, for perpendicular lines, for parallel lines , for right angle, for congruent shapes (same shape and size), three dots for “a equals b, therefore b equals a”, and  so on


you need to know what {{{Polygons}}} are

A {{{Polygon}}} is a 2-dimensional shape made of straight lines. 

example: triangles and rectangles are polygons (you find out what other polygons we have) 

Solid shapes- three-dimensional shapes ....and so on

most important is to know Pythagoras' Theorem which is very often used