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c²= 196+256
c²=452
c=√452
c=21.5
P=0.5a*h
P=7*21.5=150.5CM²
a=c
wzór (c√3)/2 na 60°
½c na 30°- 21.5*o.5= 10.75
P=7*10.75=75.25 CM²
PROSZĘ O NAJ ;)
sin30 = 1/2
sin45 = √2/2
sin60 = √3/2
tak wiec pole trojkata to 1/2*14*16*sinus odpowiedniego kata.
Wyprowadenie w zalaczniku.