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 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 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?

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

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.

Let O be the origin and vec(OX) , vec(OY) , vec(OZ) be three unit vector in the directions of the sides vec(QR) , vec(RP),vec(PQ) respectively , of a triangle PQR. if the triangle PQR varies , then the manimum value of cos (P+Q) + cos(Q+R)+ cos (R+P) is

Two triangles ABC and PQR are such that the perpendiculars from A to QR ,B to RP and C to PQ are concurrent .Show that the perpendicular from P to BC ,Q to CA and R to AB are also concurrent .