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**1.**b^2-4ac is the _________.**6.**_________ probability is probability that is determined on the basis of reasoning.**11.**Trigonometric _______ are equations involving the trigonometric functions that are true for every value of the variables involved.**13.**Given a right circular cone, which is sliced through by a plane parallel to its base, when the smaller conical portion is removed , the resulting solid is called a ______ of a right circular cone.**15.**The graphical representation of a quadratic polynomial is known as ______**17.**The of grouped data can be obtained graphically as the x coordinate of the point of intersection of the two origin gives for the data**18.**The distance between two given points is found by _______ formula.**20.**The triangles whose corresponding angles are equal and corresponding sides are ______ are called similar triangles.

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**2.**Numbers having non terminating non recurring decimal expansion are known as _______ Numbers**3.**The sequence 2,4,6,8.. lies in an ________ Progression**4.**cot stands for ______.**5.**A quadrilateral that has all sides equal but not diagonals is ________.**7.**probability of a sure event is _______.**8.**9x+3y+12=0 and 18x+ 6y+24=0 has ______ lines.**9.**An algebraic expression consisting of one term-**10.**All equilateral triangle are _____.**12.**_______ division Algorithm is used to find the HCF of two positive number.**14.**A ______ is a region bounded by a chord of a circle and the intercepted arc of the circle**16.**When linear equations have no solution, lines are ______.**19.**A point equidistant from all the points on the circumference of the circle is called it's _____.