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# Let ABC be an acute-angled triangle with circumcentre O. Let P on BC be the foot of the altitude from A. Suppose that

an interesting question,,,,i think calvin is familiar with it

Note by Superman Son
4 years, 7 months ago

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Let ABC be an acute-angled triangle with circumcentre O. Let P on BC be the foot of the altitude from A. Suppose that BCA  >= ABC + 30 . Prove that CAB + COP < 90 .

- 4 years, 7 months ago