exam Maths Puzzle Numerical Ability

True or false and why?

A parallelogram whose diagonals are congruent and perpendicular is a rhombus.

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exam Other Question

Find the indicated function.
Let f={(-9,-2),(-8,-4),(-5,-1)} and g={(-9,1),(-7,-9),(-5,-2)}. Find f+g How do you solve the square root of 18 times the square root of 3 over 10 with the 3 over 10 looking like a fraction?