Problem

QUESTION 4
The two triangles below are similar. Find the missing length(s).
$x = 21$
$x = 7$
$x = 28$
$x = 12$

Answer

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Answer

$x_{1} = \frac{12}{4}$

Steps

Step 1 ： $x_{1} = \frac{x_{2}}{x_{3}} \times x_{4}$

Step 2 ： $x_{1} = \frac{7}{28} \times 12$

Step 3 ： $x_{1} = \frac{12}{4}$

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