Answer
$a = 5$ mm
$b = 3$ mm
Work Step by Step
1. Solve for $a$
$\frac{a}{10} = \frac{6}{12}$
$a = \frac{10\times6}{12}$
$a = \frac{60}{12}$
$a = 5$ mm
2. Solve for $b$
$\frac{b}{6} = \frac{6}{12}$
$b = \frac{36}{12}$
$b = 3$ mm
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