Find the radius of the inner circle, Mathematics

Assignment Help:

The area enclosed between two concentric circles is 770cm2. If the radius of the outer circle is 21cm, find the radius of the inner circle. (Ans :14cm)

Ans: Π R2 - Π r2 = 770
Π (212 - r2) = 770

212 - r2 = 770/22 x 7 = 70/2 x 7

r2 =441 -490/2= 441 - 245=196

r= ± 14
r=14cm


Related Discussions:- Find the radius of the inner circle

Find the slope of this line, The following graph shows the growth of the me...

The following graph shows the growth of the median home value in a particular region of the United States starting in 1996.  The graphs starts in 1996 and shows the trend through t

Diffrentiation, y=f(a^x)   and f(sinx)=lnx find dy/dx? Solution) dy/dx exi...

y=f(a^x)   and f(sinx)=lnx find dy/dx? Solution) dy/dx exist only when 0 1 as the function y = f(a^x) itself does not exist.

Computation of covariance - ungrouped data, Computation of Covariance ...

Computation of Covariance Ungrouped Data          For a population consisting of paired ungrouped data points {X, Y} where,

Solve sin (a /7) =0 trig function, Solve sin (α /7) =0 . Solution B...

Solve sin (α /7) =0 . Solution By Using a unit circle it isn't too difficult to see that the solutions to this equation are, α /7 = 0 + 2 ? n     ⇒   α = 14 ? n

Geometry homework, i just have one question i need help on for my geometry ...

i just have one question i need help on for my geometry homework

Triangles, if triangle abc is similar to def and ab/de=3/4 find the ratio a...

if triangle abc is similar to def and ab/de=3/4 find the ratio af their perimeter and area

Area of polygons, ho we can find the area of diffrent types of polygon

ho we can find the area of diffrent types of polygon

Measures of central tendency, Measures of Central Tendency Measures of...

Measures of Central Tendency Measures of Central Tendency are statistical values which tend to happen at the centre of any well ordered set of data. When these measures happen

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd