Get to know the names of all the main 2-d shapes, how to recognise them and what their properties are. There’s a downloadable worksheet at the end of this post for you to try, and see how well you know 2-d shapes.

# Triangles

Equilateral triangle

o All sides equal in length and all angles the same (all 60^{o})

Isosceles triangle

o Two sides equal in length and two angles equal

Right-angled triangle

o One angle is 90^{o}

Scalene triangle

o Sides are all different lengths, angles are all different sizes

# Quadrilaterals

Square

o Four sides of equal length

o Four angles equal, all 90^{o}

o Opposite sides are parallel

Rectangle

o Four angles equal, all 90^{o}

o Opposite sides are equal length

o Opposite sides are parallel

Rhombus

o Four sides of equal length

o Opposite angles are equal

o Opposite sides are parallel

Parallelogram

o Two pairs of parallel sides

o Opposite sides are equal length

o Opposite sides are parallel

o Opposite angles are equal

Kite

o Two pairs of equal sides

o Equal sides are adjacent to each other

o Two equal angles

Arrowhead

o Two pairs of equal sides

o Equal sides are adjacent to each other

o Two equal angles

Trapezium

o One pair of parallel sides

Isosceles trapezium

o One pair of parallel sides

o Non-parallel sides are equal in length

# Polygons

Regular polygons have all sides equal in length and all angles equal

Names of polygons you should get to know:

Polygon Number of sides

Pentagon 5

Hexagon 6

Heptagon 7

Octagon 8

Nonagon 9

Decagon 10

Dodecagon 12

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