Geometry

Lengths in Polygons on the Plane

Cointerior Angles

Alternate Angles

Angles and Parallel Lines

Identifying Parallel Lines

Angles in Triangles Revision

Geometrical Calculations

Proofs with Triangles

Proofs with Quadrilaterals

Proofs Using Congruent Triangles

Applications of Circle Geometry

Proofs and Theorems involving Circles

Medians and Midpoints in a Triangle

Proofs of corresponding, alternate and cointerior angles

Class IX

Identifying Parallel Lines

Interactive practice questions

Are the lines $AB$AB and $CD$CD parallel?

Yes

A

We need more information.

B

No

C

Easy

< 1min

Are the lines $AB$AB and $CD$CD parallel?

Easy

< 1min

Consider the following image:

Easy

< 1min

Are the lines $AB$AB and $CD$CD parallel?

Easy

< 1min

Outcomes

9.G.LA.1

If a ray stands on a line, then the sum of the two adjacent angles so formed is 180° and the converse. If two lines intersect, the vertically opposite angles are equal. Results on corresponding angles, alternate angles, interior angles when a transversal intersects two parallel lines.

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