Răspuns :
salut!
Apatrat=l²=64 cm²
64=L*L/4
=>L=16 cm
=>latimea=4 cm
Pdr=2(L+l)=2*20=40 cm
AD-inaltime
=> M(ADC)=90°
m(ACD)=30°
=>m(DAC)=90-30=60°
=>m(DAB)=m(BAC)-m(DAC)=30°
A patrat=l²
A=(4-√5)²=16-8√5+5=(21-8√5) cm²
Apatrat=l²=64 cm²
64=L*L/4
=>L=16 cm
=>latimea=4 cm
Pdr=2(L+l)=2*20=40 cm
AD-inaltime
=> M(ADC)=90°
m(ACD)=30°
=>m(DAC)=90-30=60°
=>m(DAB)=m(BAC)-m(DAC)=30°
A patrat=l²
A=(4-√5)²=16-8√5+5=(21-8√5) cm²
A₁=64cm² l₄=8cm eu am dedus ca latimea dreptunghiului este cat latura patratului
fii mai explicit
l=4*8=32
P=2*(8+32)=80cm
∡DAB=90°-60°=30°
A=4√5)²=16*5=80cm² daca e 4-√5
A=(4-√5)²=16-2*4*√5+5=21-8√5
fii mai explicit
l=4*8=32
P=2*(8+32)=80cm
∡DAB=90°-60°=30°
A=4√5)²=16*5=80cm² daca e 4-√5
A=(4-√5)²=16-2*4*√5+5=21-8√5