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P=a²·sinα α=30° sin30°=¹/₂
P=¹/₂·a²
Ob=4a
po zwiększeniu
Ob'=4b=4a+20%·4a=4a+0.8a=4.8a
4b=4.8a /:4
b=1.2a
P'=b²·sinα,α=30°
P'=(1.2a)²·¹/₂
P'=1.44·¹/₂·a²
P';P=1.44:1=1.44
1.44=144%
zwiększy się o 44%