Math

posted by .

A spherical tree ornament is to be painted in bright colors. If the ornament has a diameter of 4 cm,
how much paint is needed?

  • Math -

    Wouldn't it depend on how well the paint covers area?

  • Math -

    The amount of paint you need is the exact same amount of area the ornament has.

    The problem tells you that the ornament is a sphere, so the formula for area is

    A = &pid2

    since we know d=4cm them we have

    A = &pi*(4cm)2
    A=16cm2

    Since A = the amount of paint we found the answer 16cm2

  • Math -

    In contrast to michael's post, the formula for the surface area of a square is actually

    A = 4 (pi)* r^2

    Since the diameter is 4, the radius = 2, so

    A = 4 (pi) * 4 = 16 (pi) = 16 (3.1416) = ?

    I hope this helps a little more. Thanks for asking.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A child looks at his reflection in a spherical tree ornament 12 cm in diameter, and sees an image of his face that is reduced by one-fourth. How far is his face from the ornament?
  2. physics

    A child looks at his reflection in a spherical tree ornament 12.0 cm in diameter, and sees an image of his face that us reduced by one-fourth. How far is his face from the ornament?
  3. MATH 157

    A spherical tree ornament is to be painted in bright colors. If the ornament has a diameter of 4 cm, how much paint is needed?
  4. math

    A spherical tree ornament is to be painted in bright colors. If the ornament has a diameter of 4 cm, how much paint is needed
  5. math

    A spherical tree ornament is to be painted in bright colors. If the ornament has a diameter of 4 cm, how much paint is needed?
  6. Claflin

    A reflecting, spherical Christmas tree ornament has a diameter of 8.0 cm. A child looks at the ornament from a distance of 20 cm. Describe the image she sees. image location in centimeters.
  7. physics

    A spherical Christmas tree ornament is 5.34 cm in diameter. What is the magnification of the image of an object placed 10.3 cm away from the ornament
  8. science

    A reflecting spherical Christmas tree ornament has a diameter of 12 cm. A child looks at the ornament from a distance of 18cm. A ... image will form at ... from the ornament
  9. science

    A reflecting spherical Christmas tree ornament has a diameter of 12 cm. A child looks at the ornament from a distance of 18cm. A ... image will form at ... from the ornament
  10. physics

    A girl sees her image in a shiny glass sphere tree ornament that has a diameter of 18 cm. The image is upright and is located 2.9 cm behind the surface of the ornament. How far from the ornament is the child located?

More Similar Questions