Math Problem Statement
Cho tứ giác ABCD có 4 đỉnh thuộc (O). M,N,P,Q lần lượt là trung điểm AB, BC, CD, DA. Đường thẳng qua M vuông góc với CD cắt đường thẳng qua P vuông góc với AB tại K. C/m: KN vuông góc với DA và KQ vuông góc với BC.
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Cyclic Quadrilaterals
Perpendicular Lines
Midpoints
Formulas
Sum of opposite angles in a cyclic quadrilateral: \( \widehat{A} + \widehat{C} = 180^\circ \)
Properties of midlines and perpendicular bisectors in quadrilaterals
Theorems
Properties of Cyclic Quadrilaterals
Perpendicularity in Geometry
Parallel Line Theorem
Suitable Grade Level
Grades 9-12
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