21) Prove that a parallelogram ABCD circumscribing the circle is a rhombus. 22) Find the sum of first 50 odd natural numbers. 23) Construct a pair of tangents to a circle of radius 3 cm from a point P which is 4 cms away from a circle. 24) Find the discriminant of the equation x-1 =3 when x = 0 and aslo write the nature of roots.
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