Question

find the value of given figure I want full solution in notebook​

Answer 1

Step-by-step explanation:

it's a triangle

sum of all angles of triangle is 180 degree

so ∠20° + ∠40° + ∠a = 180°

    ∠60° + a = ∠180°

      a = ∠180° - ∠60°

      a = ∠20°  

as l is parallel to m

so ∠40° = ∠b

∠b=40° (alternate angles)

as l is parallel to m

so ∠20° = ∠c

   ∠c = 20° (alternate angles)

Alternate interior angles are equal if the lines intersected by the transversal are parallel. Alternate interior angles formed when a transversal crosses two non-parallel lines have no geometrical relation.