3. 4 ст 3 cm

Find the area of the surface obtained by rotating the circle x^2+y^2=r^2 about the line y=2r

Please show full work Thanks

The surface area of a sphere of radius r is given by a = 4pir^2 and its volume is given by V = 4/3pir^3 1. If you double the radius of a sphere, then you increase its surface area by a factor of ? 2. and you increase its volume by a factor of ? 3. The relationship between v and a can be described as isometric or allometric? 4.Sketch a plot with Inv on the vertical axis and Ina on the horizontal in the space below: How do you sketch the graph? I am very confused with this part.

area with of circle radius 7?

A Christmas ball of 3cm radius is to be partially covered with gold leaf so that the covered fringe is 60° wide from the center of the ball. Calculate the area of the ball to be painted.

Determine area under curves y = x2 + 3 and y = 7 - 3x. Show with sketch

5. Label the curve to the right to describe the area of the curve contained in each section.

Find the area of ​​the figure surrounded by the two curves

can you provide a more detailed explanation of part b? i understand part a, but do not even get part b in the slightest apart from using the Surface area rule.