exam Maths Puzzle Numerical Ability

how do you find length of a path around an irregular area. For instance the path around a puzzel piece.

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exam Other Question

Determine the best method to solve the system .Then solve for x and y.

2x+y=3x-15

x+5=4y+2x
How do you solve and graph:
/c-4/ > 1

The c-4 is in absolute value lines.

Thank you!