algebra

posted by .

Suppose you have a can of paint that will cover 400 ft squared. A. find the radius of the largest circle you can paint. Round to the nearest tenth of a foot.( hint use the formula A=3.14 times radius squared
B. Suppose you have two cans of paint, which will cover a total of 800 ft squared find the radius of the largest circle you can paint round to the nearest tenth of A foot

  • algebra -

    For the area of a circle is πr² as you stated so all you do is set 400 equal to πr² and solve for r.

    400=πr²/π
    127.32=r²
    √127.32)= r
    r=11.3

    Same thing for this except you use 800 instead of 400 so.

    800=πr²
    254.64=r²
    √254.64)= r
    r=15.9 or 16.0 for rounding purposes.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Math

    Using the formula for the surface area of a SPHERE: Use Pi = 3.14 If the diameter of a sphere is 8 feet, find the surface area (round to the nearest square foot) 201 sq ft If a quart of paint covers 75 square feet, how many quarts …
  2. pre-algebra

    You want to paint a wall that is 8 3/4 feet high and 11 1/4 feet long. You have a can of paint that will cover 200 square feet with one coat. A. find the area of the wall. b. if you want to apply two coats of paint , do you have enough …
  3. math

    the dimensions of a rectangular prism are height 7 feet, width 4 feet and length 3 feet find the surface area part 2: dimensions of the cylinder are height 7 feet and radius 3.5 feet solve with a decimal then round to the nearest half …
  4. 8th grade math

    There are three walls in Jordan’s living room. The three walls, shown here, are 12 feet, 9 feet and 10 feet wide, respectively. Each wall has a height of 8 feet with a 6-inch baseboard along the bottom. The largest of the three walls …
  5. Geometry

    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. …
  6. Math.

    1. Find the area of the given circle. Round to the nearest tenth. *theres a picture of a circle and the radius is 3.5* A. 22.0 cm *squared* B.38.5 cm *squared* C. 11.0 cm *squared* D. 42.8 cm *squared* 2.Find the circumference of the …
  7. Math

    A court is 94ft long by 50ft wide.It contains 3 circles, each with a diameter of 12 ft. Two of the circles are located at the free throw line with "half of each circle shaded" and the third circle is at the center. Within the third …
  8. math

    Anna is covering a circular pool with a cover for winter. The pool's diameter is 24 feet. The cover extends 12 inches beyond the edge of the pool, and a rope runs along the edge of the cover to hold it in place. What is the area of …
  9. Math

    An artist is painting a large mural comprised of different sizes squares. She wants to pain one magenta square that is as large as possible, but she only has one can of magenta paint. If the can of paint can cover 220 square feet, …
  10. physics

    A gallon of paint will cover 300 ft2. How many gallons will you need to paint a 12-ft x 18-ft wall with two coats of this paint?

More Similar Questions