Math Problem Statement
parallélogramme de sommets N,O,I et R etde centre E tel que OR=5.4cm, l'angle OEI=80 degrés et ON=1.5cm
Solution
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Math Problem Analysis
Mathematical Concepts
Geometry
Parallelogram
Diagonals
Angles
Formulas
Length of a diagonal OR = 5.4 cm, so OE = ER = 5.4 cm / 2 = 2.7 cm
Cosine Rule for angle OEI
Properties of parallelogram diagonals and symmetry
Theorems
Properties of parallelograms: Diagonals bisect each other
Law of Cosines for non-right triangles
Suitable Grade Level
Grades 9-11
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