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Level 2

Triangles and Quadrilaterals


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Equilateral triangle
All 3 sides and 3 angles are equal.
Isosceles triangle
2 sides and 2 angles are equal.
Scalene triangle
No sides and no angles are equal.
Right-angled triangle
One angle is 90°.
Acute-angled triangle
All angles are less than 90°.
Obtuse-angled triangle
One angle is bigger than 90°.
All interior angles of a triangle
180°.
Quadrilateral
Closed 2D shape with 4 straight sides and four angles
Parallelogram
Both pairs of opposite sides are parallel. Both pairs of opposite sides are equal.Opposite angles are equal in length.
Rhombus
All 4 sides are equal in length.Both pairs of opposite sides are parallel.Both pairs of opposite sides are equal in length
Rectangle
Both pairs of opposite sides are parallel.Both pairs of opposite sides are equal in length. All angles are equal to 90° .
Square
Both pairs of opposite sides are parallel. All sides are equal in length.All angles are equal 90°.
Kite
Both pairs of adjacent sides are equal in length.Only one pair of opposite angles are equal.
Trapezium
Only one pair of opposite sides are parallel.
Irregular quadrilateral
No special properties.