GCSE Maths Practice: pie-charts

Question 10 of 12

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$ \begin{array}{l} \text{In a pie chart, 3 sectors measure 60$^\circ$, 90$^\circ$, and 75$^\circ$.} \\ \text{What angle remains for the fourth sector?} \end{array} $

Choose one option:

$ 135^\circ $ $ 120^\circ $ $ 105^\circ $