exam Maths Puzzle Numerical Ability

given: line segment gj is the perpendicular bisector of line segment hk.
Prove triangle ghm is congruent to triangle gkm.

this is a proof please help

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exam Other Question

An isosceles trapezoid must have two pairs of equal adjacent angles. State and prove the converse.

I know what the converse is, but i dont know how to prove it. i dont understand how to (9) which of the following has the same vale as -2(-7) or how to evalute 4-6 over 2 ...please explain throughly...