Question

va rog ajutatima la evaluărie​

Answer 1

Răspuns:

1.Ppatrat=44cm A=?

44:4=11cm A=11×11=121cn^2

2.paralelogram a=7cm h=5cm

A=a×h=7×5=35cm^2

3.romb l=13cm d1=10

d2/2=√13^2-5^2=√169-25=√144=12cm

d2=12×2=24cm

A=d1d2/2=10×24/2=120cn^2

5.∆dreptunghic C1=16;ip=20

c2=√400-16^2=√4×36=12cm

A=c1c2/2=12×16/2=96cm^2

4∆.laturi:13;14;15cm

A=√p(p-13)(p-14)(p-15)

p=(13+14+15)/2=42/2=21

A=√21×8×7×6=84cm^2

6.P=80=12+12+15+15+2x=>

54+2x=80

2x=26 =>x=13

BE=CD=15+13=28cm

a) A=28×12+(28+12)14/2=336+

280=616cn^2

b)8kg/m^2 cu3,3lei/kg

=>616×8×3,3=16262,4lei