exam Maths Puzzle Numerical Ability

determine the perpindicular distance between
a. the parellel planes: x+2y+3z+6=0 and x+2y+3z-6=0

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exam Other Question

Determine the measure(in degrees) of an angle whose complement is four-ninths its supplement. if the ratio of the angles of the triangle is 1:2:3 then what is the ratio of the the sides of the triangle??