Question

Solution of part 3,4,5,6,9

Answer 1

3. both sides are equal that's why :-
x= 50°
4. sum of all angles is 180° and both sides are same....so,
2x+100=180
x= 40°
5. same , both sides are are same and one angle is 90,so
2x+90=180
x= 45°
6. both sides are same so
x+40+40=180
x= 100°
9. x= 120°

Answer 2

3)in a triangle angles opposite to equal sides are equal.
therefore, x°=50°
4)in a triangle angles opposite to equal sides are equal and sum of all angles is equal to 180°.
therefore, x°+x°+100°=180°
=2x°=180°-100°
=x°=80°/2
=x°=40°.
5)in a triangle angles opposite to equal sides are equal. the non-equal angle is 90°as it is right angled triangle.
therefore, x°+x°+90°=180°
=2x°=180°-90°
=x°=90°/2
=x°=45°.
6)in a triangle angles opposite to equal sides are equal. the non-equal angle is 40° as given.
therefore ,x°+x°+40°=180°
=2x°=180°-40°
=x°=140°/2
=x°=70°.
9)in this triangle,the one of equal angles which are opposite to equal sides is one of the pair of the vertically opposite angles.
therefore ,x°=30°.