Question

ME AJUDEM É URGENTE

Answer 1

7
a
P = 2( 2x +1) + 2( x - 1)
P = 4x + 2 + 2x - 2
P = 6x ***
b
P =( 2a + 5b - 2) + ( a + b) + 2( a + 8)
P = 2a + 5b - 2 + a + b + 2a + 16
P =5a + 6b + 14
2
x = 5
a = 2
b = 3

P = 6x
P = 6 ( 5) = 30 *****
b
P = 5a + 6b + 14
P = 5(2) + 6(3) + 14
P = 10 + 18 + 14
P =42 ******

Answer 2

a)

Perímetro: soma dos lados

2.a + 2.b

a = x - 1
b = 2x + 1

p = 2.(x - 1) + 2.(2x + 1)
p = 2x - 2 + 4x + 2
p = 2x + 4x 
p = 6x

Figura 2:

p = soma dos lados

p = a + b + a + 8 + 4b + 2a + 5b - 2
p = a + a + 2a + b + 4b + 5b + 8 - 2
p = 4a + 10b + 6

b)

Figura 1:

x = 5
p = 6x
p = 6.5
p = 30 cm

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Figura 2:

a = 2
b = 3

p = 4a + 10b + 6
p = 4.2 + 10.3 + 6
p = 8 + 30 + 6
p = 38 + 6
p = 44 cm
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