If angle cfd= 12a + 45, find a so that fc is perpindicular to fd. i'm so confused..

The solution to your problem is as follows:

12a + 45⁰ = 90⁰ 
12a = 45⁰ 
a = (45/12)⁰ = 3.75⁰ 

Therefore, the angle so that FC is perpendicular to FD is 3.75 degrees.

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