6.3 answer 17 cot390 degree answer is book is square root of 3 I understand pi = 180 and angle is 30 degrees but how did you get 6pi and answer cot390=3

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter10: Measurement, Area, And Volume
Section10.3: Areas Of Parallelograms
Problem 37E
Question

6.3 answer 17 cot390 degree

answer is book is square root of 3

I understand pi = 180 and angle is 30 degrees but how did you get 6pi

and answer cot390=3

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