math

Two circles with radii 3cm and r cm touch each other externally. If their common tangent is 8cm long,what is the value of r?

  1. 👍 1
  2. 👎 0
  3. 👁 282
  1. not enough information.

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. coordinate geometry

    find the equation of circle having centre in 1st quadrant, touching x-axis,having a common tangent y=3^1/2x+4 with the circle x^2+y^2+4x+4y+4=0 such that the distance between two circles along the x-axis is 3 units ?

    asked by rakesh on October 20, 2016
  2. Bisectors in a Triangle

    Let ABC have side lengths AB=13, AC=14, and BC=15. There are two circles located inside

    asked by Knights on March 26, 2013
  3. Math

    Three identical circles are tangent to each other externally. if the area of the curvilinear formed by the point of tangency of the three circles is 142 cm2, compute the radius of each circle.

    asked by philip on October 7, 2019
  4. math

    Two circles of radius 4 are tangent to the graph of y^2=4x at the point (1,2). Find the equation of these two circles.

    asked by Anonymous on October 7, 2009
  5. PLEASE HELP TANGENTS AND CIRCLES PROBLEM GEOMETRY

    PLEASE HELP I REALLY NEED HELP. Each of the three circles in the figure below is externally tangent to the other two, and each side of the triangle is tangent to two of the circles. If each circle has radius three, then find the

    asked by Knights on February 2, 2013
  1. Geometry/Trigonometry

    Circles with centers (2,1) and (8,9) have radii 1 and 9, respectively. The equation of a common external tangent to the circles can be written in the form y=mx+b with m < 0. What is b? I drew the diagram and the tangents but to no

    asked by Sam on December 4, 2013
  2. algebra

    Rectangle R is formed by joining the centers of two congruent tangent circles and then drawing radii perpendicular to a common external tangent. If the perimeter of R is 60, what is its area?

    asked by natalie on August 27, 2008
  3. math

    Two circles of radius 4 are tangent to the graph y^2=4x at the point (1,2). Find the equations of the two circles.

    asked by David on October 14, 2009
  4. Trig

    Three circles with radii of 4, 5, and 6 cm, respectively, are tangent to each other externally. Find the angles of the triangle whose vertexes are the centers of the circles.

    asked by Chris on February 17, 2013
  5. Haley

    Three circles with radii 35cm, 50cm, and 65cm respectively are tangent to each other externally. Find the angles of the triangle formed by joining the centers of the circles. My teacher said to use the cosine law cause you know 3

    asked by Math on August 27, 2014
  6. maths

    Two circles with centers a and b of radii 3 cm and 4 cm res , intersecting at two points c and d such that ac and bc are two tangets of the circles, then length of common chord .

    asked by Phalgun on February 17, 2015

You can view more similar questions or ask a new question.