What is Geometry?
Geometry is defined as the branch of mathematics concerned with the properties and relations of points, lines, surfaces, solids and higher dimensional analogs. Geometry dates back to ancient Greek philosophers and mathematicians such as Plato and Pythagoras. Geometry looks at angles, shapes and solids and investigates their relationships and properties.
The two main shapes used in geometry are: Triangles Triangles are one of the most commonly used shapes in the world. They have many practical uses including house roofs, high voltage power poles and tents. They give strength to geometric shapes. All angles in a triangles must equal 180 degrees. The three types of triangles according to the length of their sides are: -Equilateral triangles: all three sides are equal in length -Isosceles triangles: exactly two sides are equal in length -Scalene triangles: no sides are equal in length The three types of triangles according to the size of their angles are: -Acute angled triangles: all angles less than 90 degrees -Right angled triangles: contains a right angle (90 degrees) -Obtuse angled triangles: contains an obtuse angled triangle (greater than 90 degrees) Quadrilaterals A quadrilateral is any four-sided shape but the sides have to be straight and the shape must be two-dimensional. All angles in a quadrilateral must equal 360 degrees. Examples of quadrilaterals include - squares -rectangles -kites -trapeziums -parallelograms |
Pictures
|