Pythagorean Theorem

Converse of Pythagoras theorem

Trapezium

isosceles trapezium

Parallelogram

In a right angled triangle, the square on the hypotenuse is equal to the sum of the squares on the other two sides.

If in a triangle, the square on the greatest side is equal to the sum of squares on the other two sides, then the triangle is right angled triangle.

quadrilateral in which a pair of opposite sides are parallel.

If the non-parallel sides of a trapezium are equal in length and form equal angles at one of its bases

a quadrilateral in which the opposite sides are parallel