Question

va roooog ofer coroanaa toate cele patru si ma voi abona la cel/cea care ma ajuta si o sa ii ofer coroana!

Answer 1

ex.19
latura=8,24:4=2,06cm
aria=2,06*2,06=4,2436cm
ex.20
l=700cm=7m
L=10,5m
perimetru=2*(7m+10,5m)=17,5m*2=35m
aria=7m*10,5m=73,5m
ex.21
15,2*2=30,4m-cele 2 lungimi
35m-30,4m=4,6m-cele 2 latimi
4,6m:2=2,3m-latimea
aria=15,2m*2,3m=34,96m

Answer 2

19. P = 4a=> a= P/4=8,24 cm/4= 2,6cm
A= a^2= 2,6 cm la puterea a doua = 6,76 cm ^2

20. 10,5 m=1050cm
P= 2(L+l) =2(1050cm+700 cm)=2*1750=3500cm
A = L*l = 1050*700=735000cm patrati

21. P= 2(L+l) => l + L = P/2 =35 m /2= 17,5 m=> l=17,5 m- L = 17,5m-15,2m = 2,3m
A= L*l= 15,2 m* 2,3m= 34,96m patrati

22. a .
P= 20,48 m
A=26,2144m patrati
b.
P=25,28cm
A=39.9424cm patrati
c.
P=18,08hm
A= 20,4304hm patrati
d.
P= 73.28 km
A= 335,6224km patrati
e.
P=22,88mm
A= 32,7184 mm patrati
f.
P=76,75dm
A=368,2561dm patrati
g.
P=33,4dam
A=69,7225 dam patrati
h.
P= 46,56m
A= 135, 4896 m patrati