Geometry Problem 1287


Elements: Isosceles Triangle, 40-100-40 Degrees, Congruence, Area, Metric Relations, Measurement.

In an isosceles triangle ABC, the measure of angle B is 100 degrees, AB = BC = a, and AC = b. Prove that: (1) a3 + b3 = 3a2b; (2) Formula to proof 1287.
This entry contributed by Sumith Peiris, Moratuwa, Sri Lanka.
 

Geometry Problem 1287: Isosceles Triangle, 40-100-40 Degrees, Congruence, Area, Metric Relations, Measurement


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