# NCERT Class 9 Solutions: Triangles (Chapter 7) Exercise 7.4 – Part 2

Side opposite angle

3. In the figure, and . Show that .

Solution:

Given, and

• Now,

…………..equation(1) (Side opposite to the smaller angle is smaller) ……………..equation(2) (Side opposite to the smaller angle is smaller)

Q-4 AB and CD are respectively the smallest and longest sides of a quadrilateral ABCD (see Figure)Show that and

Give, AB and CD are respectively the smallest and longest sides of a quadrilateral ABCD

• In (see the figure) …………….equation(1) (Angle opposite to longer side is larger.)

• Now,In , (see figure) ……………….equation(2) (Angle opposite to longer side is larger.)

• Adding (1) and (2) we get,

• Similarly, In , ……….equation(3) (Angle opposite to longer side is larger.)

• Now,In , …………….equation(4) (Angle opposite to longer side is larger.)

• Adding (3) and (4) we get,

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