Name the Shape circle square rectangle triangle hexagon octagon pentagon

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°

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°

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

Special Quadrilaterals These are trapezia Trapezium One pair of sides parallel

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

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

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

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

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

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

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

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

3D Shapes cuboids cubes hexagonal prism cylinders triangular prism