exam Maths Puzzle Numerical Ability

A regular triangular pyramid has a volume of 15 cm3 and base edges of length 6 cm. What is the height of the solid?

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complete ordered pair solutions

3x+4y+12 (0,),(,34) ,(,0),(83,) Given: L is the midpoint of line JN, line PJ is congruent line QN, line PL is congruent line QL, angle PKJ and angle QMN are right angles
Prove: triangle PKJ congruent triangle QMN