Geometry Problem 1429: Triangle, Median, 15-30 degree, Angle, Congruence

Problem

In a triangle ABC, BD is a median. If angle ABD = 15 degree and angle DBC = 30 degree, find the measure of the angle A.
This entry contributed by Sumith Peiris, Moratuwa, Sri Lanka. Trigonometry is not allowed.

Geometry Problem 1429: Triangle, Median, 15-30 degree, Angle, Congruence, Tutoring

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Typography and Sketch of Problem 1429: The Colosseum in the background

Geometry Problem 1429: Triangle, Median, 15-30 degree, Angle, Congruence, The Colosseum in the background

Geometric Art using 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.

A mobile app or mobile application software is a computer program designed to run on smartphones and tablet computers.

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