Question

Calculati aria: a)unui patrat cu latura de 6,1cm
b)unui dreptunghi cu laturile de 5cm si 8,2cm
c)unui romb cu diagonalele de 0,75cm si 4 c,m
d)unui patrat cu perimetrul de 1 cm
Va rog muult!!!!!!!!!

Answer 1

$A_{patrat} = l ^{2} =\ \textgreater \ A_{patrat} = 6,1^{2} = 37,21 cm ^{2} \\ A _{dreptunghi} = L*l=\ \textgreater \ A_{dreptunghi} =5 *8,2=41cm ^{2} \\ A _{romb} = \frac{d _{1} * d _{2} }{2} =\ \textgreater \ A _{romb} = \frac{0,75*4}{2} = \frac{3}{2} =1,5cm^{2} \\ \\ P_{patrat} = 4*l =\ \textgreater \ 4*l=1=\ \textgreater \ l= \frac{1}{4} =0,25cm \\ A_{patrat}=l^{2}=\ \textgreater \ A_{patrat}=0,25^{2}=0,0625cm^{2}$