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 60o)
Isosceles triangle
o Two sides equal in length and two angles equal
Right-angled triangle
o One angle is 90o
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 90o
o Opposite sides are parallel
Rectangle
o Four angles equal, all 90o
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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