One Shot Revision of Lines and Angles | Class 9 NCERT | Maths | Doubtnut | Seema Ma'am

Two straight lines AB and AC include an angle. A circle is drawn in this angle which touches both these lines. One more circle is drawn which touches both these lines as well as the previous circle. If the area of the bigger circle is 9 times the area of the smaller circle, then what must be the angle A ?

The length of hypotenuse of a right angled triangle is 3sqrt(10) . If among two perpendicular lines, smallest one is tripled and bigger one is double bled, the hypotenuse of new right angled triangle thus formed is 9sqrt(5) unit. The length of smallest and the bigger sides are respectively.

In a certain college at the B.Sc. examination, 3 candidates obtained first class honours in each of following subjects: Physics, Chemistry and Maths, no candidates obtaining honours in more than one subject Number of ways in which 9 scholarships of different value be awarded to the 9 candidates if due regard is to be paid only to the places obtained by candidates in any one subject is

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