The formula of the area of the trapezoid is:
![\displaystyle{ A_{trapezoid}= \frac{1}{2} h(b_1+b_2)](https://tex.z-dn.net/?f=%5Cdisplaystyle%7B%20A_%7Btrapezoid%7D%3D%20%5Cfrac%7B1%7D%7B2%7D%20h%28b_1%2Bb_2%29)
,
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](https://tex.z-dn.net/?f=%5Cdisplaystyle%7B%20A_%7Btrapezoid%7D%3D%20%5Cfrac%7B1%7D%7B2%7D%20h%28b_1%2Bb_2%29%3D%20%5Cfrac%7B1%7D%7B2%7D%20%5Ccdot%203%5Ccdot%20%285%2B7%29%3D%5Cfrac%7B1%7D%7B2%7D%20%5Ccdot%203%5Ccdot%2012%3D3%5Ccdot6%3D18)
. (km)
Answer: B. 18
Answer:
(7/2)2
Step-by-step explanation:
Answer:
4500 cm²
Step-by-step explanation:
10 mm = 1 cm
So 450 × 10
= 4500 cm²