Geometry › Polygons › Angles in pentagons

Angle in pentagon with inner triangle

High school · ●●○○○ 20 pts

In a regular pentagon ABCDEABCDE, an equilateral triangle ABMABM is drawn so that MM lies inside the pentagon. Determine the size of the angle BCMBCM in degrees.

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interior anglesregular polygonsequilateral triangleisosceles trianglesangle chasing