Transcript Document
All about Shapes Properties of Shapes Number of sides Number of angles Number of lines of symmetry Regular or irregular Right Angles Parallel lines Shapes Triangles Quadrilaterals Polygons Regular Shapes Key Words Quadrilaterals Shapes with 4 sides! What shape is this? Quadrilaterals A Square Quadrilaterals How many lines of symmetry does a square have? 1 3 Quadrilaterals 4 2 Properties of a Square Has 4 equal sides Has 4 equal angles Quadrilaterals Each angle is a right angle Has 4 lines of symmetry Is a regular shape What shape is this? Quadrilaterals A Rectangle Quadrilaterals How many lines of symmetry does a rectangle have? 1 Quadrilaterals 2 Properties of a Rectangle Has 2 pairs of equal sides Has 4 equal angles Quadrilaterals Each angle is a right angle Has 2 lines of symmetry Is an irregular shape What shape is this? Quadrilaterals A Parallelogram Quadrilaterals How many lines of symmetry does a parallelogram have? Quadrilaterals None! Properties of a Parallelogram Has 2 pairs of equal sides Has 2 pairs of equal angles Quadrilaterals Opposite sides are parallel Has NO lines of symmetry Is an irregular shape What shape is this? Quadrilaterals A Rhombus Quadrilaterals How many lines of symmetry does a rhombus have? 1 Quadrilaterals 2 Properties of a Rhombus Has 4 equal sides Has 2 pairs of equal angles Quadrilaterals Opposite sides are parallel Has 2 lines of symmetry Is an irregular shape What shape is this? Quadrilaterals A Trapezoid Quadrilaterals How many lines of symmetry does a trapezoid have? Quadrilaterals None! How many lines of symmetry does this trapezoid have ? Quadrilaterals 1 Because these angles are equal. Properties of a Trapezoid Quadrilaterals Has unequal sides One pair of opposite sides are parallel Usually has NO lines of symmetry Is an irregular shape What shape is this? Quadrilaterals A diamond Quadrilaterals How many lines of symmetry does a diamond have? 1 Quadrilaterals Properties of a diamond Has 2 pairs of equal sides Has 1 pair of equal angles Quadrilaterals Equal sides are adjacent Has 1 line of symmetry Is an irregular shape Quadrilaterals Quadrilaterals Shapes with 4 sides! Triangles Shapes with 3 sides! What type of triangle is this? Triangles An Equilateral Triangle Triangles How many lines of symmetry does an equilateral triangle have? 1 Triangles 2 3 Properties of an Equilateral Triangle Has 3 equal sides Has 3 equal angles Triangles Each angle is a 60o angle Has 3 lines of symmetry Is a regular shape What type of triangle is this? Triangles An Isosceles Triangle Triangles How many lines of symmetry does an Isosceles Triangle have? 1 Triangles Properties of an Isosceles Triangle Has 2 equal sides Has 2 equal angles Triangles Has 1 line of symmetry Is an irregular shape What type of triangle is this? Triangles A Scalene Triangle Triangles How many lines of symmetry does a scalene triangle have? Triangles None! Properties of an Scalene Triangle Has NO equal sides Has NO equal angles Triangles Has NO lines of symmetry Is an irregular shape What type of triangle is this? Triangles A right triangle Triangles Properties of a right triangle Has 1 right angle May be an isosceles triangle Triangles May have 1 line of symmetry Is an irregular shape It will be isosceles and have 1 line of symmetry when these 2 sides are equal. Triangles Triangles Shapes with 3 sides! Key Words Regular Shape Parallel Perpendicular Vertex Diagonal Bisect Regular Shape Shapes are regular when All their sides are the same length All their angles are the same size Parallel Lines are parallel when they are always the same distance apart. Perpendicular Lines are perpendicular when they meet at right angles. Vertex A Vertex is a corner of a shape where two lines meet. Diagonal A Diagonal is a straight line that joins one corner (vertex) of a shape to a non adjacent corner (vertex) Bisect A line that cuts a shape exactly in half, Bisects the shape Key Words Regular Shape Parallel Perpendicular Vertex Diagonal Bisect Polygons Shapes with many sides! What shape is this? Polygons A Hexagon Polygons How many lines of symmetry does a hexagon have? 4 1 Polygons 5 3 6 2 Properties of a Regular Hexagon Has 6 equal sides Polygons Has 6 equal angles Has 6 lines of symmetry What shape is this? Polygons A Pentagon Polygons How many lines of symmetry does a pentagon have? 1 Polygons 3 5 4 2 Properties of a Regular Pentagon Has 5 equal sides Polygons Has 5 equal angles Has 5 lines of symmetry Polygons Polygons Shapes with many sides! Lines of Symmetry - Look at these shapes Can you suggest a rule? Regular shapes All the sides are the same length Regular Shapes All the angles are equal Have the same number of lines of symmetry as the number of sides Look at these shapes Regular Shapes Heptagon Octagon How many lines of symmetry? Lines of symmetry Regular Shapes Heptagon 7 Octagon 8 Lines of symmetry Regular Shapes Heptagon 7 Octagon 8