Lines and Angles in One Shot | Class 9 | Maths | Doubtnut | Akshay Sir

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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 ?

In a class, boys stand in a single line. One of the boys is nineteenth in order from both the ends. How many boys are there in the class?

In a school, students must take at least one of these subjects: Maths, Physics or Chemistry. In a group of 50 students, 7 take all three subjects. 9 take Physics and Chemistry only, 8 take Maths and Physics only and 5 take Maths and Chemistry only. Of these 50 students, x take Maths only, x take Physics only and x + 3 take Chemistry only. Draw Venn diagram, find x, and hence find the number taking Maths.

Three lines intersect at a point generating six angles . If one of these angles is 90^(@) , then the number of other distinct angles is :