Question

2.
In figure, l, ll 12 and mill m2. Prove that
21+ Z2 = 180°.​

Answer 1

Here M1 || M2 and L2 is transversal line

On line M1 where L2 intersects that angle is equal to angle 2 by co exterior angles so both angles are 90 °

Then angle next to it will also be 90 ° because of linear pair is of 180 ° ( straight line ) it will be 180 ° - 90°= 90°

Now by taking L1 || L2 and M1 transversal line

angle1 is equal to 90 ° by corresponding angles

therefore 90 ° + 90° = 180 ° by co interior angle property