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Equilateral triangleAll three sides equalAll three angles equal

Isosceles triangleTwo equal sidesTwo equal angles

Scalene triangleNo equal sidesNo equal angles

Right triangle (sometimes called a Right angled triangle)The two sides next to the right angle may or may not be equalOne angle of 90oOther angles may or may not be equal

Obtuse triangleOne angle greater than 90o

Acute triangleAll angles less than 90o

Congruent trianglesABCongruent means the same asLines, angles, circles and polygons can all have congruence.ABABCongruent linesCongruent anglesCongruent circlesCongruent means equal in size and shape but not necessarily in orientation or position

The parts of three dimensional shapesFace the surface of the shape. This shape has 6 faces.Vertex (for one) or vertices (for more than one) where the edges of the shape meet, this shape has 8 vertices Edge where two faces join. This shape has 12 edges.

PrismsPrisms are named for the shape of their basesThis is a hexagonal prism

This is a rectangular prism

A cube is a special type of rectangular prism where all faces are squaresA triangular prism has bases that are trianglesMore about prisms

Other three dimensional shapesA cylinder has two parallel congruent circular faces.A pyramid has one polygonal base (not necessarily square) and lateral triangular faces that meet at a common vertex called the apex.ApexA cone is similar to a pyramid but has a circular base and so only one curved face.A sphere is made up of all the points in space that are the same fixed distance from its centre.

Using the right words the language of shapes

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