Answer:
Step-by-step explanation:
other two sides joining center to the ends of chord=radius of circle=12 in
using cosine formula

The simplest form as a fraction would be 1/16.
1/10 is equal to 100/1000, as that way, both the numerator and the denominator are multiplied by 100.
This works because the number multiplying the top and bottom are equal, therefore resulting in no net change.