Question

The polygons are similar. Find the value of x.

Answer 1

Answer:

x = 30

Step-by-step explanation:

 12 : 20 = 18 : x

⇒ 12/20 = 18/x

⇒ 12x = 18 · 20

⇒ 12x = 360

⇒ x = 360 ÷ 12

⇒ x = 30

Answer 2

$\\ \rm\Rrightarrow \dfrac{21}{x}=\dfrac{14}{20}$

$\\ \rm\Rrightarrow \dfrac{21}{x}=\dfrac{7}{10}$

$\\ \rm\Rrightarrow 7x=210$

$\\ \rm\Rrightarrow x=30$