Question

a = b = 6 18 8 3 10 10

Explanation:

Step1: Analyze vertical lengths

Looking at the vertical sides of the figure, we know that the total vertical length on the left is 18. The part below the 'a' - section is 10. So, we can find 'a' by subtracting.
$a = 18 - 10=8$

Step2: Analyze horizontal lengths

Looking at the horizontal sides of the figure, we know that the total horizontal length on the bottom is 10. The part to the left of the 'b' - section is 6. So, we can find 'b' by subtracting.
$b=10 - 6 = 4$

Answer:

$a = 8$, $b = 4$