TRIANGLES

4. The point of concurrence of all three altitudes of a triangle.
7. Medians, altitudes, angle bisectors and perpendicular bisectors of an ……….. triangle coincide with each other.
8. If the bisector of the vertical angle of a triangle bisects the base of the triangle then the triangle is ………….
13. Sum of any two angles of a triangle is always less than ….. right angles
14. Angles ……….. to equal sides are equal.
16. Difference between any two sides of a triangle is less than its third side.
17. If two sides of a triangle are unequal then the longer side has the ……… angle opposite to it.
18. ……… of any two sides is greater than the third side.
19. The perpendicular line segment drawn from a vertex to the opposite side.

1. In a congruent triangle ……….. sides and angles are equal
2. A line segment joining the mid point of a side with the opposite vertex.
3. Of all the line segments than can be drawn to a given line from a point not lying on it the ………. line segment is the shortest.
5. Every triangle should have at least ……… angles
6. If two right angles triangles have any two sides equal then they are always congruent. (True = Tr , False = Fa)
9. The longest side of the triangle has the …………. Altitude opposite to it.
10. If two angles of a triangle and the included side of the triangle are equal to the corresponding angles and side of the other triangles are equal then the triangles are ……..
11. A triangle whose all sides are of different length.
12. Two triangles with all angles equal are congruent to each other. (True = Tr , False = Fa)
13. If two plane figures are congruent then their areas must be equal.
15. A triangle cannot have more than one ………… angle