exam Maths Puzzle Numerical Ability

how do i find the perimeter and area of a rectangle in the coordinate plane:

L(0,1)M(3,5)N(5,5)P(5,1)

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exam Other Question

The sum of two integers is 36, the difference is 6. What is the smaller of the two numbers? What is the value of k if one root of (3k+1)x^2-2kx=-5 is 1?