Provide your best answer for the following math problem. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The problem is: find the area of trapezium whose parallel sides are 10 cm and 18 cm long , and the distance between them is 15 cm .
210 cm 2
75 square centimeters.