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Science Chapter-1Chemical reaction and equations.. Practice assignment... Important
02/02/2020

Science Chapter-1
Chemical reaction and equations..

Practice assignment... Important

02/02/2020

Important question for Class-X(Maths)
Find the length of the tangent from a point M which is at a distance of 17 cm from the centre O of the circle of radius 8 cm.

Sol.

Consider the figure:



Since, MN is the tangent of the circle,

∠MNO = 90⁰

⟹ MO2 = MN2 + ON2

⟹ 172 = MN2 + 82

⟹ 289 = MN2 + 64

⟹ 289 – 64 = MN2

⟹ MN2 = 225

⟹ MN = 15

Thus, the length of the tangent is 15 cm.

Q. If the common difference of an A.P. is 3, then find a20 – a15.

Sol.

Let the first term of the AP be a.

an = a(n − 1)d

a20 – a15 = [a + (20 – 1)d] – [a + (15 – 1)d]

02/02/2020

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