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Published byChastity Carpenter Modified over 9 years ago

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**Name the Shape circle square rectangle triangle hexagon octagon**

pentagon

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**Triangle Names A triangle has 3 sides and 3 angles c 60° a b a**

The angles and sides of this triangle are all different. Equilateral triangles have 3 equal sides and 3 equal angles. Isosceles triangles have 2 equal sides and 2 equal angles. It is a scalene triangle. a + b + c = 180°

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**Triangle Names c b a 90° obtuse angle This is a**

This is an obtuse-angled triangle. This is a right-angled triangle. c a b This is an acute-angled triangle. obtuse angle One angle is obtuse One angle is 90°. 90° a, b and c are all acute angles greater than 90° less than 90°

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**Quadrilaterals A quadrilateral has 4 sides and 4 angles.**

It can be split into 2 triangles. and 4 angles. The sum of the angles of any quadrilateral = 2 x 180° = 360°. p + q + r + s = 360° p q r s

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**Special Quadrilaterals**

These are trapezia Trapezium One pair of sides parallel

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**Special Quadrilaterals**

These are parallelograms Opposite sides parallel a b Opposite angles equal Opposite sides equal Parallelogram

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**Special Quadrilaterals**

These are rhombuses Rhombus Unequal diagonals Parallelogram with all sides equal Diagonals perpendicular

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**Special Quadrilaterals**

These are rectangles Diagonals equal Rectangle Parallelogram with perpendicular sides Diagonals not perpendicular

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**Special Quadrilaterals**

These are squares Rectangle with all sides equal Square Diagonals at right angles Diagonals equal

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**Special Quadrilaterals**

These are kites Unequal diagonals Kite Two pairs of adjacent sides equal Diagonals at right angles

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**Pentagons A regular pentagon has 5 equal sides and 5 equal angles**

A pentagon has 5 sides and 5 angles. A regular pentagon has 5 equal sides and 5 equal angles

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**Hexagons A regular hexagon has 6 equal sides and 6 equal angles**

and 6 angles. A hexagon has 6 sides A regular hexagon has 6 equal sides and 6 equal angles

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**Octagons A regular octagon has 8 equal sides and 8 equal angles**

An octagon has 8 sides and 8 angles. A regular octagon has 8 equal sides and 8 equal angles

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3D Shapes cuboids cubes hexagonal prism cylinders triangular prism

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