3 . C
Draw a picture showing the triangle.
The area of a triangle is . The base of this triangle can be considered to
be the side along the y-axis. The length of this side is . The height of this triangle
drawn to the side along the y-axis is the distance from the point to the y-axis. This
distance is the x-coordinate of the point , which is . The area of the triangle is
4 . E
The volume of a right circular cone is . If the radius of cone B is x and the height is y,
then the area is . The radius of cone A will be and the height will be , so the
volume is
The ratio of the volume of cone A to that of cone B is therefore
5 . A
The volume of a right circular cylinder having a radius r and a height h is πr^2 h. To find the
volume of this right circular cylinder, you need its radius and its height. Now the area of a
