math - grade 7

posted by .

determine the diameter of a circle with a radius of 4.26m.

determine the area of the circle with diameter is 8mm.

  • math - grade 7 -

    d = 2 r

    d = 2 * 4.26 = 8.52 m


    A = d ^ 2 pi / 4

    A = 8 ^ 2 pi / 4

    A = 64 pi / 4

    A = 16 pi mm ^ 2

    A = 16 * 3.14 = 50.24 mm ^ 2

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    the number of noncollinear points needed to determine a circle Two. The location of the center, and one point on the circle (ie, the length of radius), you have determined the circle. However, the circle thus determined can be an an …
  2. 8th grade math

    circle A has a raduis that is twice the length og the raduis of circle B. Which is an accurate statement about the relationship of these areas of circle A and B and y?
  3. MATH HELP PLEASE

    You are given two different circles. The diameter of the first circle is the radius of the second circle. What is the ratio of the area of the larger circle to the area of the smaller circle. Your answer should be in the form of a …
  4. Physics

    you measure the diameter of a circle then you calculate the radius of the circle using this diameter. (1) Which one has a greater uncertainty, the diameter or the radius?
  5. math

    A circle has an area of 25 pi cm^2.If a circle is drawn within that circle with a diameter equal to the radius of the first circle, what is the area of the second circle?
  6. summer math hw

    one circle has a diameter of 10 inches. a second circle has a diameter that is twice the diameter of the first circle What is the ratio of the area of the smaller circle to the larger circle
  7. mathematics,physics,life science,LO,afrikaans

    A number of circles are given and the area of the smallest circles is 4π.The area of the next circle is 9/4 times of the previous circle.if there are 6 circles,determine the length of the diameter of the last circle.
  8. math

    1. A(-3;4) is a point on a circle with centre at the origin. a.determine the coordinates of B, if AB is a diameter. b. Show that point C(0;5) lies on this circle. c.show that ACB has a magnitude of 90degrees. 2.a.ddetermine the equation …
  9. Math

    The radius of the larger circle is 9cm. The diameter of the smaller circle is 11cm. Find the area of the shaded region The shaded area is between the larger circle and smaller circle . It is concentric The area of the larger circle …
  10. Math

    If the diameter of a circle P is 40 percent of the diameter of circle Q, then the area of circle P is what percentage of the area of circle Q?

More Similar Questions