Answer:
108 square units
Step-by-step explanation:
I could be wrong but:
Base=12
perimeter=42
Rectangles have 2 sets of congruent sides so you take
12(base) x 2 because there is 2 sides that are equal and it equals 24.
Take 42-24 wihich gives you 18 because you have already found both bases
Divide 18 by 2 (=9) because you have to sides left.
Then all the sides: 12, 12, 9, 9 add up to 42 as the perimeter and you do a simple base times height.
Please give brainliest
