The radii of two circles are 8cm and 6cm respectively . Find the radius of the circle having area equal to the sum of the areas of the two circles
ABCD Is a rhombus and P, Q, R and S are the mid points of the sides AB, BC, CO, and DA respectively. Show that the quadrilateral PQRS is a rectangle
it is shown a right circular cone of height 30 cm. A small cone is cut off from the top by a plane parallel to the base. If the volume of the small cone is 1 27 of the volume of cone, find at what height above the base is the section made.