Question

19. Considere a figura a seguir.
12
3
x
2
r
s
t
Sendo as retas r, s e t paralelas, o valor de x é:
a) 5 b) 8 c) 10 d) 12 e) 15​

Answer 1

Resposta:

1)

\frac{16}{x} = \frac{20}{4}

x

16

=

4

20

20 x = 16 × 4

20 x = 64

x = 64/20

x= 3,2

2)

\frac{4}{12} = \frac{x}{21}

12

4

=

21

x

12 x = 4 × 21

12 x = 84

x:= 84/12

x = 7