Question

Dots are spaced one unit apart, horizontally and vertically. The number of square units enclosed by the polygon is

$5$

$6$

$7$

$8$

$9$

Answer: B

Concepts:area decomposition lattice point

Difficulty rating: 870

Solution:

Consider the $2 \times 3$ rectangle on the bottom. The triangular piece above that rectangle has the same area as the missing triangular piece below it. Rearranging one into the other gives a full $2 \times 3$ rectangle, so the polygon's area is $6$ .

Thus, the correct answer is B .

1998 AMC 8 Problem 6

Answer: B

Difficulty rating: 870

Solution:

Problem 6 in Other Years