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OpenStudy (anonymous):
In △PQR, what is the length of line segment QR?
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OpenStudy (anonymous):
Directrix (directrix):
QR = 22/√2 = 11√2 The 45-45-90 theorem states that the hypotenuse of a triangle = a leg times √2. To get the leg back, divide the hypotenuse by √2.
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