Advertisements
Advertisements
Question
The radius of a circle is 7ab – 7bc – 14ac. Find the circumference of the circle. `(pi = 22/7)`
Advertisements
Solution
We have, radius of the circle = 7ab – 7bc – 14ac = r ...[say]
We know that,
∵ The circumference of the circle = 2πr
= `2 xx 22/7 xx (7ab - 7bc - 14ac)`
= `44/7 xx 7(ab - bc - 2ac)`
= 44[ab – c(b + 2a)]
APPEARS IN
RELATED QUESTIONS
Using the identity (a + b)(a – b) = a2 – b2, find the following product
(p + 2)(p – 2)
Evaluate the following, using suitable identity
990 × 1010
Factorise the following algebraic expression by using the identity a2 – b2 = (a + b)(a – b)
9 – 4y2
Using suitable identities, evaluate the following.
9.8 × 10.2
Using suitable identities, evaluate the following.
(9.7)2 – (0.3)2
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`x^2/9 - y^2/25`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
`(x^3y)/9 - (xy^3)/16`
Factorise the following using the identity a2 – b2 = (a + b)(a – b).
x4 – y4
Factorise the expression and divide them as directed:
(9x2 – 4) ÷ (3x + 2)
Verify the following:
(m + n)(m2 – mn + n2) = m3 + n3
