One of the bases of a trapeze is equal to 3.6 dm that makes 45% of other basis. Calculate the area of a trapeze if its height is equal to 2.5 dm.

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The area of a trapeze on formula S = 1/2 * (a + b) * H a = 3.6 dm - the small basis of b = 3.6: 45 = 3.6: 0.45 = 8 dm - the big basis of S = (3.6 + 8) * 2.5: 2 = 11.6*2.5/2 = 29/2 = 14.5 dmĀ² - the ANSWER
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