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11111nata11111 [884]
3 years ago
14

HELP ASAP !!! aknxkjna

Mathematics
1 answer:
kherson [118]3 years ago
8 0
The formula of the area of the trapezoid is:

\displaystyle{ A_{trapezoid}= \frac{1}{2} h(b_1+b_2), 

where h is the height, and b_1 and b_2 are the two bases of the trapezoid.


In our problem h=3km, and the bases are 5km and 7 km. Substituting these values in the formula, we find:

\displaystyle{ A_{trapezoid}= \frac{1}{2} h(b_1+b_2)= \frac{1}{2} \cdot 3\cdot (5+7)=\frac{1}{2} \cdot 3\cdot 12=3\cdot6=18. (km)


Answer: B. 18
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