Q. 155.0( 1 Vote )

# In Figure 5.73 tw

In the above figure,

a and 3 form a linear pair and hence their sum has to be 180°.

So 2 + 3 = 180°

Given, 1 + 2 + 3 = 230°

1 + 180° = 230°

1 = 230 – 180

1 = 50°.

1 + 2 = 180° as they form linear pair.

So 2 = 180 – 50

2 = 130°

So 4 = 2 = 130° as they are vertically opposite angles.

So 1 = 50° and 4 = 130°.

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