51) Which is the triangle that has its three angles individually less than 90 Degree?

52) What is the drawing instrument used for measuring angle?

53) What is the drawing instrument used for measuring angle?

54) What is the third angle of a triangle if the sum of its two angle is 112 Degree?

55) What is a plane figure bound by a curve formed by the locus of a point that moves so that it is always at a fixed distance from a stationary point is its centre?