bids are invited for lep for teachers straw flute , 3 in 1 toy , double straw spinner , straw spinner , anti gravity funnel , straw worm model , puppeteer whistle , magnetic geometry , bird whistle , pascal bag , hand pump , double hand pump , smart siphon , vasudha vaika pyula , straw siphon , self starting siphon , anti gravity fountain , height might , boyles syringe , bottle turbine , tetrahedron , cube , octahedron , dodecahedron , circling around a gear , trammel 4 , trammel 6 , gear jack , hamiltonian path , reauleux car , lever system , optical bench , periscope , sine wave car , triangular wave car , cycloid car , straight line drawer , vertical pen stand , pulley system , gear l , a4 sheet ratio of sides , who feels colder baby or adult , adult square roots in a4 - y or adult square roots in a4 , root spirel , cutting a newspaper and getting isosceles triangle , equilateral triangle from a4 sheet. , largest equilateral triangle from a4 sheet , largest equilateral triangle from a square. , going to the moon , convert a4 sheet to square using all the paper , a4 sheet to rectangle of given size , beautiful paper folding knot technique , fold a4 sheet once to get shapes , triangle to square of same area , circle to cone , largest cones from same circle , regular polygon using a cone , geometric series , regular pentagon from paper folding , knot magic , sum of interior angles of a triangle , sum of interior angles of a triangle version 2 , sum of interior angles of a quadrilateral , sum of interior angles of a polygon , properties of a circle , tangent from an external point , corresponding and alternate angles , fractions , area of a triangle acute , area of a triangle acute , area of a triangle slice , area of a parallelogram , area of a trapezium , area of a polygon picks theorem , a plus b squre , a - b2 , sum of first n numbers , sum of odd numbers , sum of cubes , sum of square of hemchandra numbers , sum of gp , sum of general infinite gp , missing area puzzle , magical ratio of a4 , rectangle to square sliding method - rectangle to square (sliding method) , rectangle to square parallelogram method total quantity : 344