Answer: Hard to say exactly-- 3 dimensions given.
If 3 x 10, 30 square yards. If 10 x 7, 70 square yards. If 7x3, it's 21 square yards.
Explanation:
Rectangles have only 2 dimensions: Length and width. Multiply the two numbers to get Area.
I hope this helps you figure it out,no matter what dimensions are given. Remember the Area will be expressed as Square Units.