Geometry Problem 40 with Solution:

Triangle, Incenter, Excenter, 40, 60, 80 Degrees


In a triangle ABC, the angles A and B measure 80 and 40 respectively, I is the incenter and E the excenter. AB and CE meet at D. If BC = a, AC = b and CI = d, prove that: \(DE= \dfrac{a \cdot (a-b)}{d}\).

Geometry problem 40: Triangle, Incenter, Excenter, Math Infographic, Tutor

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Poster of problem 40

Poster of Geometry Problem 40: Triangle, Incenter, Excenter, 40, 60, 80 Degrees, iPad Apps, Typography. Math Infographic, Tutor

Geometric Art using iPad or Mobile Apps

Geometric art is a form of art based on the use and application of geometric figures. A geometric figure is any set or combination of points, lines, surfaces and solids.

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Geometry Problem 40 Solution(s)