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NCERT republished be not to
The six elements of a triangle are its three angles and the threesides. The line segment joining a vertex of a triangle to the mid point of itsopposite side is called a median of the triangle. A triangle has3 medians. The perpendicular line segment from a vertex of a triangle to itsopposite side is called an altitude of the triangle. A triangle has3 altitudes. An exterior angle of a triangle is formed, when a side of a triangle isproduced. The measure of any exterior angle of a triangle is equal to the sum ofthe measures of its two interior opposite angles.
TRIANGLES 157 UNIT 6 Example 9: L et ABC and DEF be two triangles in which AB = DE, BC = FD and CA = EF. The two triangles are congruent under the correspondence
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