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

Trigonometry, Solve the following: Line Bearings Distance a...

Solve the following: Line Bearings Distance a. N 15 E 4km b. S 10 E ? c. N 80 W ?

Mathematics Warm-Ups for CCSS, Ask question #Minimum 100 words accepted wha...

Ask question #Minimum 100 words accepted what is a ratio

Word problem, adison earned $25 mowing her neighbor''s lawn. then she loane...

adison earned $25 mowing her neighbor''s lawn. then she loaned her friend $18, and got $50 from her grandmother for her birthday. she now has $86. how much money did adison have to

Continuity requirement, Continuity requirement : Let's discuss the continu...

Continuity requirement : Let's discuss the continuity requirement a little. Nowhere in the above description did the continuity requirement clearly come into play.  We need that t

Trignomentry, 128sinpower8=cos8-8cos6+28cos4-56cos2+35

128sinpower8=cos8-8cos6+28cos4-56cos2+35

Prove asymptotic bounds for recursion relations, 1. (‡) Prove asymptotic b...

1. (‡) Prove asymptotic bounds for the following recursion relations. Tighter bounds will receive more marks. You may use the Master Theorem if it applies. 1. C(n) = 3C(n/2) + n

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