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Trójkąt
42 = ½ × (x+12) × b
42=1/2x +6 * b /-6
36=1/2x*b /*2
72=xb
Trapez
44 = ½(2x+x+2x-4+x) ×4
44=x+1/2x+x-2+1/2x*4
44=2x-2 *4
44=2x-8 /+8
52=2x /:2
x=26
Równoległobok
28 = x + 2x - 8 + x + 2x - 8
28=6x-18 /+18
46=6x /:6
x=7.6666666666667