Răspunsuri

2014-04-01T11:14:05+03:00

a)A=24*18=432

b)BD²=24²+18²=576+324

BD²=900

BD=√900=30



2014-04-01T12:41:08+03:00
Aria dreptunghiului = l*L=24*18=432 cm^2
Perimetru= suma tuturor laturilor= 2L+2l=2(l+L)=2*(18+24)=84 cm
diagonala este ipotenuza in trg dreptunghic ABD
T Pitagora ⇒ BD^2=AB^2+AD^2=324+576=900 ⇒ BD=30 cm
Pentru a calcula distanta de la B la AC (BE), scriem aria trg dreptunghic ABC in 2 moduri⇒AB*AC/2=AC*BE/2 ⇒ 18*24=30*BE ⇒BE=18*24/30=14,4 cm