Calculate 6339

Calculate the missing side and the area of the ABCD trapezoid if you know:

side a = 7.5
side b = 3.6
side d = 4.4
height v = 3.4
circumference o = 19

c =?
S =?

Correct answer:

c =  3.5
S =  18.7

Step-by-step explanation:

$$\begin{gathered} a=7.5 \\ b=3.6 \\ d=4.4 \\ v=3.4 \\ o=19 \\ c=o-(a+b+d)=19-(7.5+3.6+4.4)=3.5 \end{gathered}$$

$S=(a+c)\cdot v/2=(7.5+3.5)\cdot 3.4/2=18.7$

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