oblicz pole rombu jeżeli jego pierwsza przekątna ma 4cm a druga ma 9cm
d1 = 4cm
d2 = 9cm
P =1/2 * d1 * d2
P = 1/2 * 4 * 9
P = 18cm^2 -------- odpowiedź
e=4cm
f=9cm
P=ef/2
P=4*9/2=36/2=18
P=18cm^2
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d1 = 4cm
d2 = 9cm
P =1/2 * d1 * d2
P = 1/2 * 4 * 9
P = 18cm^2 -------- odpowiedź
e=4cm
f=9cm
P=ef/2
P=4*9/2=36/2=18
P=18cm^2