Question

alguém min ajuda a responder essa pergunta por favor

Answer 1

a)c=40m e p=120

p=2c+2l ⇒ 120=2*40+2l ⇒ 2l=120-80 ⇒ 2l=40 ⇒ l=40/2 ⇒ l=20

S=l*c=40*20=800m²

Answer 2

a)
 
2.40+2.L=120
80+2.L=120
2L=120-80
2L=40
L=40/2
L=20m

A=L.40
A=20.40
A=800m²

b)

P=2.(2,74+1,52)
P=2.(4,26)
P=8,52m

A=2,74.1,52
A=4,1648m²

c)

$L=\sqrt{196}$
L=14m

P=4.14
P=56m

d)

C=90/3
C=30m

L=90/6
L=15m