Geometry Problem 1288
Elements: Triangle, 30-50-100 Degrees, Area, Inradius, Metric Relations, Measurement.
In a triangle ABC, angle B = 100 degrees, angle C = 50 degrees,
BC = a, AC = b, and AB = c. Prove that: (1) Area of triangle ABC = bc/4;
(2) Inradius 
;
(3) 
.
This entry contributed by Sumith Peiris, Moratuwa, Sri Lanka.
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Geometry Problems
1281-1290
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Triangle
Triangle Area
30 degrees
Angles
Inradius