Answer :

15 degrees is 1/6 of a right angle because a right angle is 90 degrees and 90/6 = 15
the magnitude of a right angle is 90°. 
we are asked to find a fraction of 90°. 
one sixth as a fraction is 1/6. 
therefore to find 1/6th of a right angle we can calculate as follows
1/6 of 90
when we have the 'of' function it means to multiply 
[tex] \frac{1}{6} * 90 [/tex]
numerators are multiplied by numerators and denominators multiplied by denominators 
[tex] \frac{90}{6} = 15 [/tex]
angle is 15°
therefore 1/6th of right angle is 15°

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