congruent - the same size and shape, similar - corresponding angles are equal and sides are in proportion. one shape can become the other after a resize., rotational symmetry - how many times a shape fits onto itself in one 360 degree turn, line of symmetry - images on either side of it are reflections of each other, quadrilateral - any four sided polygon, isosceles - a triangle with two equal sides and two equal angles, equilateral - a triangle with three equal sides and three 60 degree angles, scalene - a triangle with no equal length sides, parallelogram - a quadrilateral with two pairs of equal sides and two pairs of equal angles, rhombus - a quadrilateral with four sides the same length, trapezium - a quadrilateral with only one pair of parallel sides, formula for area of a triangle - A = b x h ⨫ 2, formula for area of a rectangle - A = b x h, formula for area of a parallelogram - A= b x h, formula for area of a trapezium - A = h(a+b) ⨫ 2, regular polygon - a shape with all sides and angles equal, exterior angle - the angle between any side of a shape, and a line extended from the next side, total degrees in any quadrilateral - 360, interior angle - the angle inside a shape, total degrees in any pentagon - 540, total degrees in any hexagon - 720, interior angles in a polygon formula - A = 180(n-2) ⨫ n,

Gcse polygon key terms

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