Shapes
Shapes come in all forms and sizes. Have a look at the shapes below.
Circle
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Diamond
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Rectangle
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Cylinder
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Hexagon
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Oval
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Traingle
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Square
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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
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The sides 1 and 2 are equal and the angles at the base are equal. |
Equilateral
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The sides 1,2 and 3 are equal and all three angles are equal. |
Right-angled
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A right angled triangle has a 90 degree angle. |
Quadrilaterals
Quadrilateral shapes have 4 sides.
Square
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Rectangle
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Parallelogram
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Area of a Triangle
Perpendicular means upright or vertical.
Area= ½ × base × perpendicular height
A=½ × b ×h
Area of a Rectangle
Area= length × width
A= l × w
Area of a Circle
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
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Cone
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Cylinder
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Volume of a Cylinder
Volume= (pi × radius²)×height
V= πr²× h
Volume of a Cuboid
Volume= length × width × height
V= l × w × h