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**Using the right words – the language of shapes**

Each slide has one or more shapes and description(s). The help you learn and pronounce the words, click on the audio to play the commentary.

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**Contents – click to jump to the page**

Equilateral triangle Isosceles triangle Scalene triangle Right triangle Obtuse triangle Acute triangle Congruence The parts of 3-D shapes Prisms – hexagonal prism More about prisms Some other 3-D shapes

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Equilateral triangle All three sides equal All three angles equal

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Isosceles triangle Two equal sides Two equal angles

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Scalene triangle No equal sides No equal angles

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**The two sides next to the right angle**

may or may not be equal One angle of 90o Other angles may or may not be equal Right triangle (sometimes called a Right angled triangle)

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One angle greater than 90o Obtuse triangle

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All angles less than 90o Acute triangle

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**A B A B A B “Congruent” – means “the same as” 𝑨 ≅𝑩 Congruent lines**

Lines, angles, circles and polygons can all have congruence. A Congruent lines Congruent triangles A B B Congruent angles A Congruent circles B Congruent means equal in size and shape but not necessarily in orientation or position

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**The parts of three dimensional shapes**

Face – 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. The parts of three dimensional shapes

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**Prisms Prisms are named for the shape of their bases**

This is a hexagonal prism Prisms

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**This is a rectangular prism**

A cube is a special type of rectangular prism where all faces are squares A triangular prism has bases that are triangles More about prisms

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**Other three dimensional shapes**

A cylinder has two parallel congruent circular faces. Apex A pyramid has one polygonal base (not necessarily square) and lateral triangular faces that meet at a common vertex called the apex. A 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. Other three dimensional shapes

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**Using the right words – the language of shapes**

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