There's not much point in giving "guidance" if we don't know what you know about parallelograms, diagonals, etc. Show us that by giving your own attempt at this.
#3
LiHJ
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Dear HallsofIvy,
I have already posted my working to that question. Thank you
#4
LiHJ
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posted under Homework and course work problem, Pre-Calculus topic. Thank you