A-B-C is a 60-80-40-degree triangle, respectively with I as incenter.
Prove that CI = AB.

*This entry contributed by Sumith Peiris, Moratuwa, Sri Lanka.*

Geometry Problems

Ten problems: 1381-1390

Visual Index

Open Problems

All Problems

Triangle

Incenter

Congruence

Incenter distance

80-20-80 Isosceles Triangle

View or Post a solution