Question

what is the area of rectangle cdef?
area = $square$ square units

Explanation:

Step1: Identify side lengths

From the grid, length of $CD$: $7 - (-4) = 11$ units; length of $CF$: $10 - 5 = 5$ units.

Step2: Calculate rectangle area

Use formula $Area = length \times width$
$Area = 11 \times 5$

Answer:

55 square units