Formula: Area = length x width
Formula: Area = side x side
Formula: Area = 1/2 x diagonal x (sum of offsets)
Formula: Area = base x corresponding height
Formula: Area = 1/2 x base x height
Formula: Area = Semi Perimeter x (Semi Perimeter - Side 1) x (Semi Perimeter - Side 2) x (Semi Perimeter - Side 3)
Formula: Area = π x radius x radius