# 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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1281-1290

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Triangle

Triangle Area

30 degrees

Angles

Inradius

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