Answer:
it's 30inches
Explanation:
I'm doing it right now
A 30 in
The ratio of the sides must be equal if they are proportional
36 x
------- = ---------
12 10
Using cross products
36*10 = 12*x
360 =12x
Divide each side by 12
360/12 = 12x/12
30 =x
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