Co-interior and exterior angles — lesson. Mathematics State Board, Class 7.

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Let us see some more pairs of angles, in this lesson.

1. Co-interior angles:

Each pair of angles named

$∠3$ and

$∠6$ ,

$∠4$ and

$∠5$ are marked on the same side of transversal line

$l$ and are lying between the lines

$m$ and

$n$ . These angles are lying on the interior of the lines

$m$ and

$n$ as well as the same side of the transversal line

$l$ . So these are called as co-interior angles.

2. Co-exterior angles:

Each pair of angles named

$∠1$ and

$∠8$ ,

$∠2$ and

$∠7\$ are marked on the same side of transversal line

$l$ and are lying outside of the lines

$m$ and

$n$ . These angles are lying on the exterior of the lines

$m$ and

$n$ as well as the same side of the transversal line

$l$ . So these are called as co-exterior angles.

Did you find an error?

5. Co-interior and exterior angles