exam Maths Puzzle Numerical Ability

A circle is centered at the origin. The coordinates of one end point of a diameter are (3 + square root of 2, -4). What are the coordinates of the other endpoint of the diameter?

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Hi,

I need help with this problem: Find the base of a triangle with an area of 15 sq cm and 4 cm height.

Thank you This is really stumping me can you help?
Use common logarithms and a calculator to evaluate to four decimal places:
log612 (it is a lower six)

Thanks in advance