Calculating yellow area (area trapezoid).
Let x be the height of the yellow area.
a = 3-1
a = 2 units.
b = 1+8
b = 9 units.
Calculating x.
It implies;
9 ~ x
x ~ 2
Cross Multiply.
x² = 18
x = √(18)
x = 3√(2) units.
Again, x is the height of the yellow area.
Therefore, area yellow is;
½(3+1+8)*x
= ½*12*3√(2)
= 18√(2) square units.
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