Area of a circle
GCSE Maths Tutor has free videos for many GCSE Maths topics
Arcs
Sectors
Learn GCSE Maths - use the GCSE Maths Forum to ask questions
Segments
Triangles
When a triangle is incribed in a rectangle of height h and width b, the perpendicular divides the shape. It can be seen that each rectangle formed is composed of two triangles of equal area. Hence the area of the original triangle is half that of the rectangle.
The expression containing the sine is really the same as above.
Why not try out the new GCSE Maths interactive pages?
Parallelograms
Trapeziums
Contact GCSE Maths Tutor here - info@gcsemathstutor.com
|
|
video:area of a triangle from base-length and height
interactive: approx. area circle 
