Question

problem 9 show or describe another way to determine the area.

Explanation:

Another method is to use Pick's Theorem, which states the area \( A \) of a lattice polygon is \( A = I + \frac{B}{2} - 1 \), where \( I \) is interior lattice points and \( B \) is boundary lattice points. Count \( I \) (points inside) and \( B \) (points on edges), then substitute into the formula.

Answer:

Use Pick's Theorem: \( A = I + \frac{B}{2} - 1 \), where \( I \) is interior lattice points and \( B \) is boundary lattice points; count \( I \) and \( B \), substitute into the formula.