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r = √ x² + y²
= √ (4√3)² + 4²
= √ (16√9) + 16
= √ 48 + 16
= √64
= 8
Arc tan = y/x
= -4/4√3
= - ( 4/4√3 x 4√3/4√3) --dirasionalkan
= - ( 16√3/16√9)
= - ( 16√3/48 )
= - 1/3 √3
= 30 drajat
L = tan ( 360 - 30 )
= tan 230
= 230 drajat
koordinatnya = { r , L }
= { 8, 230 darajat}