What is the formula to convert a parcel of land to square feet?

I am currently trying to figure the square feet of a 4 sided parcel.

Side 1: 100 feet

Side 2: 158 feet

Side 3: 81 feet

Side 4: 135 feet

I am currently trying to figure the square feet of a 4 sided parcel.

Side 1: 100 feet

Side 2: 158 feet

Side 3: 81 feet

Side 4: 135 feet

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