College Geometry Online, eLearning

Obtuse Angle Theorems and Problems - Table of Content

Obtuse Angle Index

Euclid's Elements 23 definitions

Euclid's Elements Book I, 23 Definitions. One-page visual illustration. Definition 11: Obtuse Angle.
Euclid's Elements Book. Index

Obtuse Triangle Index

Obtuse Triangle.

Euclid's Elements, Book II, Proposition 12

Euclid's Elements Book II, Proposition 12: Law of Cosines.
Obtuse triangle, obtuse angle.

Feuerbach Theorem, Obtuse Triangle illustration.
Obtuse angle.

Pythagoras curiosity. Online tutoring.

The Pythagorean Curiosity Triangles and squares, fifteen conclusions.
Several obtuse angles.

Angles 30, 60, 120 Index

Angles: 30, 60, Obtuse angle 120 degrees.

Angle 45, 90, 135, Theorems and Problems

Angles: 45, Obtuse angle 135 degrees.

Euclid's Elements Book I,1 Proposition 5, Isosceles Triangle

Euclid's Elements Book I, Proposition 5: (Pons Asinorum) Isosceles triangles
Obtuse angle.

Geometry Problem 1033

Geometry Problem 1033.
Triangle, Angle Obtuse, Circumcircle, Diameter, Area.

Problem 923

Geometry Problem 923.
Quadrilateral, Quadrangle, Obtuse Angle, Triangle, Diagonal, Inequality, Length.

Regular pentagon

Proposed Problem 429.
Circumscribed and Inscribed Regular Pentagon, Perpendicular, Measurement, Obtuse angle.

Triangle, Angle, Congruence

Proposed Problem 423.
Triangle, 30, 40 degree, Angle, Congruence, Obtuse angle.

Triangle, Angle, Congruence

Proposed Problem 422.
Triangle, 24, 30 degree, Angle, Congruence, Obtuse angle.

Triangle, Median, Angles

Proposed Problem 411.
Triangle, Median, Angles, Obtuse angle.

Regular pentagons, Angle

Proposed Problem 410.
Two Regular Pentagons, Obtuse angle, Angle.

Quadrilateral, 60, 75, 135 degrees

Proposed Problem 405.
Quadrilateral, 60, 75, and 135 degrees, Midpoint, Obtuse angle.

Square, 15 degree

Proposed Problem 395.
Square, 15 Degree, Equilateral triangle, Obtuse angle.

Triangle, 120 degrees, angle bisectors

Proposed Problem 368.
Obtuse Triangle, Obtuse angle: 120 degrees, Angle bisectors, Perpendicular.

Equilateral triangle, circumcircle

Proposed Problem 366.
Scalene triangle, Circumcircle, Angles, 60 Degrees, Equilateral triangle, Obtuse angle.

Triangle area, Circle, Curvilinear triangle

Proposed Problem 364.
Obtuse triangle, Obtuse angle, Congruence, Circles, Diameter, Curvilinear triangle, Area.

Area of a triangle

Proposed Problem 322.
Square, Inscribed circle, Tangent, Triangle area.
Obtuse angle.

Triangle and angle bisector of 120 degrees

Proposed Problem 304.
Triangle, Angle bisector of obtuse angle: 120 degrees. Obtuse triangle.

Elearn 212: 120 degree triangle, area

Proposed Problem 212. Obtuse angle 120 Degree, Equilateral triangles, Areas.
Obtuse triangle.

Problem: Triangle, Altitude, Angles

Proposed Problem 199. Triangle, Quadrilateral, Angles, Obtuse angle.

Area of Square and triangle, Elearning.

Proposed Problem 112. Area of square and obtuse triangle.

Obtuse triangle 

Problem 47. Obtuse Triangle, median, and angles.

Obtuse triangle 

Problem 46. Obtuse Triangle, median, and angles.

Obtuse triangle

Problem 14. Obtuse Triangle, median, and angles.

Geometry terms

Geometry Online Glossary . Obtuse angle
Geometry Glossary based on the new New York State mathematics standards initiative.

Obtuse triangle

Problem 1. Obtuse Triangle, median and angles.


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Jul 24, 2014