Triangle, Quadrilateral, Circle, Brahmagupta, Concyclic, Square, Congruence, Area, Hexagon, High School, College

Geometry Problems 871-880: Triangle, Quadrilateral, Circle, Brahmagupta, Concyclic, Square, Congruence, Area, Hexagon. Level: High School, College


	Geometry Problem 871 Brahmagupta's Theorem, Cyclic Quadrilateral, Perpendicular Diagonals, Midpoint.
	Geometry Problem 872 Quadrilateral, Triangle, Angle, 30, 90 degrees.
	Geometry Problem 873 Quadrilateral, Diagonal, Triangle, Angle Bisector, Congruence.
	Geometry Problem 874 Isosceles Triangle, Circumcircle, Circumcenter, Congruence.
	Geometry Problem 875 Congruent Circles, Intersecting Circles, Secant, Center, Angle Trisection, Triple Angle.
	Geometry Problem 876 Equilateral Triangle, any Point, Perpendicular, Right Triangle Area, Sum of Areas.
	Geometry Problem 877 Square, Right Triangle, Similarity, Metric Relations, Transversal.
	Geometry Problem 878 Square, Inscribed Circle, Quadrant, Center, Perpendicular, Metric Relations.
	Geometry Problem 879 Square, Midpoint, Diagonal, Ratio 3:1, Angle Measure.
	Geometry Problem 880 Triangle, Midpoints, Sides, Perpendiculars, Hexagon, Area.