In which of the following circles are the values of the area and circumference the same? approximate π as 3.14. a circle with a radius of 2 feet a circle with a diameter of 2 feet a circle with a radius of 4 feet a circle with a diameter of 1 foot

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Rewrite the following quadratic functions in intercept or factored form. show your work. y = 9 + 12x + 4x^2

For every corresponding pair of cross sections, the area of the cross section of a sphere with radius r is equal to the area of the cross section of a cylinder with radius and height 2r minus the volume of two cones, each with a radius and height of r. a cross section of the sphere is and a cross section of the cylinder minus the cones, taken parallel to the base of cylinder, is the volume of the cylinder with radius r and height 2r is and the volume of each cone with radius r and height r is 1/3 pie r^3. so the volume of the cylinder minus the two cones is therefore, the volume of the cylinder is 4/3pie r^3 by cavalieri's principle. (fill in options are: r/2- r- 2r- an annulus- a circle -1/3pier^3- 2/3pier^3- 4/3pier^3- 5/3pier^3- 2pier^3- 4pier^3)