exam Maths Puzzle Numerical Ability

hi, i would like to know a formula that can find the area of a irregular polygon or any irregular polygon. so please try to help me.

thanks a lot.
bye.

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exam Other Question

Solve each of the following systems by using either addition or substitution. If a unique solution does not exist, state whether the system is dependent or inconsistent.
10x + 2y = 7
y = -5x + 3 an angle is 14 degrees more than the measure of its complement. find the number of degrees in each angle