exam Maths Puzzle Numerical Ability

Determine the measure of angle A of triangle ABC given the following information:
a=12, b=13, c=6

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exam Other Question

f(x)=x^2-3
f(x)=-1/2x^2+3
f(x)=x^2+4x+1
f(x)=x^2-10x+3 The length of the sides of a triangle are consecutive even intergers. Find the length of the longest side if it is 22 units shorter than the perimeter.