Trapezium bases

Find the trapezium height if a = 8 cm and c = 4 cm if its content 21 square centimeters.

Correct answer:

h =  3.5 cm

Step-by-step explanation:

$$\begin{gathered} a=8 \\ c=4 \\ S=21 \\ S=(a+c)h\mathrm{/}2 \\ h=2\cdot S\mathrm{/}(a+c)=2\cdot 21\mathrm{/}(8+4)=3.5\text{ cm} \end{gathered}$$

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