Isosceles trapezoid

Calculate the circumference and the contents of the isosceles trapezoid if you know the size of the bases is 8 and 12 cm and the size of the arms is 5 cm.

Correct result:

o =  30 cm
S =  45.826 cm2

Solution:

$o=8+12+2 \cdot \ 5=30 \ \text{cm}$
$S=\sqrt{ 5^{ 2 }-(4/2)^{ 2 } } \cdot \ (8+12)/2=45.826 \ \text{cm}^2$

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