2. 外语
  3. A trapezoid has one base of 8 ft, a height of 3 ft, and an area of 30 ft2. What is the length of the other base?

A trapezoid has one base of 8 ft, a height of 3 ft, and an area of 30 ft2. What is the length of the other base?

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问题 A trapezoid has one base of 8 ft, a height of 3 ft, and an area of 30 ft2. What is the length of the other base?
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答案12 ft
解析 The equation for the area of a trapezoid is A = 1/2(base1+ base2)(height). Substitute the given variables into the equation and solve for the missing base:
30=1/2(8 + base2)(3)
20 =(8 + base2)
base2 = 12 ft
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