Question
In the figure, NPQ is an equilateral triangle, JKLM is a square and PKLQ is a straight line. Find the sum of ∠r, ∠s, ∠t and ∠u.
4 m

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In the figure, NPQ is an equilateral triangle, JKLM is a square and PKLQ is a straight line. Find the sum of ∠r, ∠s, ∠t and ∠u.