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P/_\=3cm*2,5cm:2=7,5cm2:2=3,75cm2
P/_\=3,75 cm2
P |--| = a*b
P|--| = 1cm*4,5cm=4,5cm2
P /_\ = 1cm*4,5cm:2=4,5cm2:2=2,25cm2
P |--| + /_\ = 4,5cm2+2,25cm2=6,75cm2
∀π↑α