2 / 5 + ? / 15 = 16 / 15
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First we need to find ∡PRQ. To do this we can use the fact that the sum of the interior angles of a triangle is 180°:
Now, we can use the fact that a strait line (like SRQ) is also 180°:
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Now, we can use the fact that a strait line (like SRQ) is also 180°:
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