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Published byElliott Wotton Modified about 1 year ago

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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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Equilateral triangle Isosceles triangle Scalene triangle Right triangle Obtuse triangle Acute triangle Congruence Contents – click to jump to the page 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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Right triangle (sometimes called a Right angled triangle) The two sides next to the right angle may or may not be equal One angle of 90 o Other angles may or may not be equal

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Obtuse triangle One angle greater than 90 o

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Acute triangle All angles less than 90 o

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Congruent triangles A B “Congruent” – means “the same as” Lines, angles, circles and polygons can all have congruence. A B A B Congruent lines Congruent angles Congruent circles 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.

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Prisms Prisms are named for the shape of their bases This is a hexagonal prism

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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. A pyramid has one polygonal base (not necessarily square) and lateral triangular faces that meet at a common vertex called the apex. 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.

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Using the right words – the language of shapes THE END

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