1. Find the unknown

Observe the figure given below and answer the questions that follow.
 
13.svg
 
If the angles \(a\) and \(b\) are in the ratio 3 \(:\) 15, find the value of '\(a\)' and '\(b\)'.
 
\(a =\) \(^\circ\)
 
\(b =\) \(^\circ\)
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