exam Maths Puzzle Numerical Ability

I hope that I can explain this correctly so you may understand it. Here it is:

It is an oblique triangle.
You are to find the size of angle F

Measurements are:

D to F =

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exam Other Question

hi.i dont get how to find the second midpoint with the given midpoint, here is my question....T(6,2) [[this is 1st endpoint]]M(2,0)[[this is midpoint]] ???what is the 2nd endpoint. 4 + x = 2x