exam Maths Puzzle Numerical Ability

Explain how you could prove that the quadrilateral is of that type.

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exam Other Question

A^2 = x ------ (1)
4A^2= x+147 ------ (2)
(2)-(1) implies 147=3A^2 implies A^2=49 implies A=7 i.e,length of the sides = 7 cms I accidently signed up to be a tutor. can someone please tell me how to cancel tha.