In fig. 10, `A , B , C` and `D` are four points, and no three points are collinear. `A C` and `B D` intersect at `Odot` there are eight triangle that you can observe. Name all the triangles.

Take four distinct points, A,B,C and D no three of which are collinear. Name the line segments.

Take four distinct point A,B ,C and D , out of which three points are collinear Name the line segments.

Take four distinct point A,B ,C and D , out of which three points are collinear Find the number of lines that can be drawn passing through these points.

In Fig. 10.39, A, B, C and D are four points on a circle. AC and BD intersect at a point E such that /_B E C"\ "="\ "130o and /_E C D"\ "="\ "20odot Find /_B A Cdot

Take four distinct points, A,B,C and D no three of which are collinear. Find the number of lines that can be drawn passing through these points

Mark four points A ,\ B ,\ C\ a n d\ D in your notebook such that no three of them are collinear. Draw all the lines which join them in pairs as shown in Fig. How many such lines can be drawn? Write the names of these lines. Name the lines which are concurrent at A .

A, B, C and D are four points on a circle. AC and BD intersect at a point E such that /_B E C\ =130^(@) and /_E C D=20^(@) Find /_B A C^(@)

In fig.9, D is a point on side B C of a \ A B Cdot\ \ A D is joined. Name all the triangle that you can observe in the figure. How many are they?

In fig.9, D is a point on side B C of a \ A B Cdot\ \ A D is joined. Name all the triangle that you can observe in the figure. How many are they?

A , B , C , D are any four points, prove that vec A Bdot vec C D+ vec B Cdot vec A D+ vec C Adot vec B D=4(Area \ of triangle ABC).