Take three non-collinear points P,Q and R on a page of your note-book.Joint PQ,QR and RP.What figure do you get?Name the triangle.Also name:
the side opposite to `angle Q`.

Take three non-collinear points P,Q and R on a page of your note-book.Joint PQ,QR and RP.What figure do you get?Name the triangle.Also name: the angle opposite to side PQ

Take three non-collinear points P,Q and R on a page of your note-book.Joint PQ,QR and RP.What figure do you get?Name the triangle.Also name: the side opposite to vertex side QR.

Take three collinear points A,B,C on a page of your note-book.Join AB,BC and CA. Is the figure a triangle ?If not,why?

Draw the images P' Q' R' of the points P,Q,R respectively in the line l . Join P'Q' R to form an angle P'Q'R .What can you say about the two angles anglePQR and angleP'Q'R

Let vec O A= vec a , hat O B=10 vec a+2 vec ba n d vec O C= vec b ,w h e r eO ,Aa n dC are non-collinear points. Let p denotes the areaof quadrilateral O A C B , and let q denote the area of parallelogram with O Aa n dO C as adjacent sides. If p=k q , then find kdot

Let l be a line and P be a point not on l. Through P, draw a line m parallel to l. Now join P to any point Q on l. Choose any other point R on m. Through R, draw a line parallel to PQ. Let this meet lat S. What shape do the two sets of parallel lines enclose?

Let PQR be a triangle of area Delta with a = 2, b = 7//2 , and c = 5//2 , where a, b and c are the lengths of the sides of the triangle opposite to the angles at P, Q and R, respectively. Then (2 sin P - sin 2P)/(2 sin P + sin 2P) equals

P, Q, R are three points in a plane. Join them in pairs. How many lines will you get if- (a) P, Q and R are not collinear. (b) P, Q and R are collinear.

Points P, Q and R lie on sides BC, CA and AB respectively of triangle ABC such that PQ || AB and QR || BC, prove that RP II CA.