exam Maths Puzzle Numerical Ability

how do u find the perimeter of a triangle with the angles of 12cm ,18cm, 19cm and a height of 12cm

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exam Other Question

Solve the equation.
3/y=y/5y-12
Find a value for k so that 9m(squared)- kn(squared) will have the factors 3m + 7n and 3m - 7n.

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