Sum of their areas is given find radii of the two circles, Mathematics

Assignment Help:

Two circles touch externally. The sum of their areas is 58 π cm2 and the distance between their centres is 10 cm. Find the radii of the two circles. (Ans:7cm, 3cm)

701_circle15.png

Ans:    Sum of areas = Π r2 + Π (10 - r )2 = 58 Π Π r2 + Π (100 - 20 r + r2) = 58 Π

r2 + 100 - 20r + r2 = 58

2r2 - 20r +100 - 58 = 0

2r2 - 20r +42 = 0 r2 - 10r +21 = 0

(r-7), (r-3) = 0

r=7cm,3cm


Related Discussions:- Sum of their areas is given find radii of the two circles

Fermats last theorem, Explain Fermats Last Theorem? How to solve problems u...

Explain Fermats Last Theorem? How to solve problems under Fermats Last Theorem?

Calculate the edges in an undirected graph, Calculate the edges in an undir...

Calculate the edges in an undirected graph along with two vertices of degree 7, four vertices of degree 5, and the remaining four vertices of degree are 6? Ans: Total degree of

Integral test- harmonic series, Integral Test- Harmonic Series In ha...

Integral Test- Harmonic Series In harmonic series discussion we said that the harmonic series was a divergent series.  It is now time to demonstrate that statement.  This pr

find the original number, A two-digit number is seven times the sum of its...

A two-digit number is seven times the sum of its digits.  The number formed by reversing the digits is 18 less than the  original number. Find the original number.

Area, #What is an easy way to find the area of any figure

#What is an easy way to find the area of any figure

Types of infinity, TYPES OF INFINITY : Mostly the students have run across...

TYPES OF INFINITY : Mostly the students have run across infinity at several points in previous time to a calculus class. Though, when they have dealt along with this, this was jus

Give the introduction to ratios and proportions, Give the introduction to R...

Give the introduction to Ratios and Proportions? A ratio represents a comparison between two values. A ratio of two numbers can be expressed in three ways: A ratio of "one t

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