It is not possible to answer the question because you have not provided the measurement units for 60 and 120: micrometres, inches, miles?
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Surface area of rectangle: 15 times 8 = 120 square inches
b and h both equal 30 (square); area = 30 X 30 = 900 SQ IN
Area = length x width = 10in x 12in = 120in2
120 inches squared
The area of rectangle is : 120.0