If the index lies to the left of zero it is said to be 'on the arc' and all observed angles will be too large by the amount of the Index Error and therefore subtracted.
Ukuba isalathisi silalela ngakwicala lasekhohlo kwiqanda kuthiwa ikwisazinge kwaye zonke iimbombo ezijongiweyo zakuba nkulu kakhulu ngokomlinganiselo wempazamo yesalathisi ngapha koko ithatyathwe.