Geometry

posted by .

A dartboard consists of five concentric circles. The radius of the smallest circle is about 1 inch. The radius of the second circle is about 3 inches longer. The radius of the third circle is about 1 inch longer than the previous circle. The radius of the fourth circle is about 2 inches longer than the previous circle. The radius of the largest circle is about 0.75 inches greater than the previous circle. What is the difference between the circumferences of the largest and smallest circle? Round your answer to the nearest tenth of an inch.

  • Geometry -

    radius 1 = 1
    radius 2 = 1+3 = 4
    radius 3 = 4+1 = 5
    radius 4 = 5+2 = 7
    radius 5 = 7+.75 = 7.75

    circumference 1 = 2π(1) = 2π
    circumference 5 = 2π(7.75) = 15.5π

    difference in circumference = 15.5π - 2π= 13.5π
    = appr. 48.7 inches

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    This question is based on a project- Describe three concentric circles having a 1-inch, a 3-inch, and a 4-inch radius. Draw the diameter of the large circle.(This is also the diameter of the two smaller circles) Please I Need So Much …
  2. geometry

    a target consists of five concentric circles, each with a radius 1 inch longer than that of the previous circle. calculate the area between the third and fourth circles from the center.
  3. Math

    Circle C has radius 4 inches. Circle D had radius 9 inches. These two circles are connected. Point A,B,and E are points of tangency. Find AB. From point C to point D(which is the radius of circle C plus the raduis of circle D) it is …
  4. math gre question

    in an infinite series of circles the radius of the second circle is one half the radius of the first circle and the radius of the third circle is one half the radius of the second circle. if the first circle has a radius of one inch …
  5. Algebra

    The area of a circle is given by the formula A+pier^2, where r is the radius. If increasing the radius of a circle by 1 inch gives the resulting circle an area of 100pie square inches, what is the radius of the original circle?
  6. Geometry about the circles

    1. Ab is a chord of a circle with center o and radius 52 cm . point m divides the chord ab such that am = 63 cm and mb=33 cm find om 2. A circle is inscribed in a triangle whose sides are 10, 10 and 12 units . a second smaller circle …
  7. Pre-Calc (Circles). Please help :(

    Five concentric circles with radii 1, 2, 3, 4, and 5 are drawn as shown dividing the circle of radius 5 into five regions: a circle of radius 1 and 4 annuuli (rings). What is the probability that a point chosen randomly from within …
  8. math

    The area of a circle is given by the formula A = ðr2, where r is the radius. If increasing the radius of a circle by 1 inch gives the resulting circle an area of 100ð square inches, what is the radius of the original circle?
  9. Geometry

    Segment AD is perpendicular to the radius of circle (B) and the radius of circle (c). If radius BA=6in, segment AD=21in and radius CD=16in, find the length of BC to the nearest tenth of an inch.
  10. Math

    A circle with a 4-inch radius is centered at A, and a circle with a 9-inch radius is centered at B, where A and B are 13 inches apart. There is a segment that is tangent to the small circle at P and to the large circle at Q. It is …

More Similar Questions