Question

what is the best estimate for the area of the triangle, in square units?

Explanation:

Step1: Count full - squares

Count the number of full - squares inside the triangle. Assume each small square has an area of 1 square unit.

Step2: Combine partial squares

Combine the partial squares to form whole squares as much as possible.

Step3: Calculate area

Sum up the number of full and combined whole squares. By counting, we can see that the area of the triangle is 18 square units.

Answer:

18