Shapes
Shapes come in all forms and sizes. Have a look at the shapes below.
Circle![]() |
Diamond![]() |
Rectangle![]() |
Cylinder![]() |
Hexagon![]() |
Oval![]() |
Traingle![]() |
Square![]() |
2D Shapes
2D (dimensions) shapes are flat they do not have any volume.
The following are examples of 2D shapes:
- Triangle
- Rectangle
- Circle
Triangles
Triangles have 3 sides and the total angles of a triangle add up to 180 degrees. There are different types of triangles.
Isosceles![]() |
The sides 1 and 2 are equal and the angles at the base are equal. |
Equilateral![]() |
The sides 1,2 and 3 are equal and all three angles are equal. |
Right-angled![]() |
A right angled triangle has a 90 degree angle. |
Quadrilaterals
Quadrilateral shapes have 4 sides.
Square![]() |
Rectangle![]() |
Parallelogram![]() |
Area of a Triangle
![area of triangle](shapes/triangle1.jpg)
Perpendicular means upright or vertical.
Area= ½ × base × perpendicular height
A=½ × b ×h
Area of a Rectangle
![area of rectangle](shapes/rectanglearea.jpg)
Area= length × width
A= l × w
Area of a Circle
![area of circle](shapes/circlearea.jpg)
Area= pi × radius x radius
A = π × r x r
or A = π × r²
The value for π is 3.14
3D Shapes
A 3D shape has width, depth and height.
Cube![]() |
Cone![]() |
Cylinder![]() |
Volume of a Cylinder
![area of rectangle](shapes/cylindervol.jpg)
Volume= (pi × radius²)×height
V= πr²× h
Volume of a Cuboid
![area of a cuboid](shapes/cuboidarea.jpg)
Volume= length × width × height
V= l × w × h