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lyn94
03.06.2021 •
Mathematics
If mAB = 30° and mCD = 110°, find mLE.
D
110°
А
30°
E
с
B
O 15°
O 30°
O 40°
O 70°
Solved
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Ответ:
40
Step-by-step explanation:
Use the Outside Angles Theorem,
Ответ:
P must be on the third angle bisector as well
Step-by-step explanation:
The point P must be on the third angle bisector as well, because it is a theorem in Euclidean geometry that the three interior angle bisectors of a triangle meet in a single point.
This point is called the incenter. In Euclid's Elements, Proposition 4 of Book IV proves that this point is also the center of the inscribed circle of the triangle.
The incenter is defined as the point where the internal angle bisectors of the triangle cross.