Question

Solve it class 9 lines and angles

Answer 1

as we that figure is made by two triangles..

sum of all three angles in a triangle iis 180°.

sum of all angles in two triangles = 180 × 2 = 360°.

hence A + B + C + D + E + F = 360°

Answer 2

Answer:

Step-by-step explanation:

In triangle ADC

<A+<D+<C=180 (angle sum property)        ...-(i)

In triangle EFB

<E+<F+<B=180 (angle sum property)        ...-(ii)

adding (i)&(ii)

<A+<D+<C+<E+<F+<B=180+180

<A+<D+<C+<E+<F+<B=360

hence proved

I hope it will be helpful....