1. A cone has a base diameter of $8$ cm and a vertical height of $8$ cm.
   Work out the volume of the cone.
2. A solid cone has base radius $9$ cm and vertical height $12$ cm.
   Work out the total surface area of the cone.
   Give your answer correct to 3 significant figures. (Curved surface area of a cone $= \pi r l$, where $l$ is the slant height.)
3. Two cones are joined base-to-base to make a solid.
   Both cones have base radius $r$ cm.
   One cone has slant height $4r$ cm and the other has slant height $5r$ cm.
   The total curved surface area of the solid is $300\pi$ cm².
   Work out the value of $r$.
   Give your answer correct to 3 significant figures. (Curved surface area of a cone $= \pi r l$.)

1. A cone has a base diameter of $8$ cm and a vertical height of $8$ cm.
   Work out the volume of the cone.
2. A solid cone has base radius $9$ cm and vertical height $12$ cm.
   Work out the total surface area of the cone.
   Give your answer correct to 3 significant figures. (Curved surface area of a cone $= \pi r l$, where $l$ is the slant height.)
3. Two cones are joined base-to-base to make a solid.
   Both cones have base radius $r$ cm.
   One cone has slant height $4r$ cm and the other has slant height $5r$ cm.
   The total curved surface area of the solid is $300\pi$ cm².
   Work out the value of $r$.
   Give your answer correct to 3 significant figures. (Curved surface area of a cone $= \pi r l$.)

1. A cone has a base diameter of $8$ cm and a vertical height of $8$ cm.
   Work out the volume of the cone.
2. A solid cone has base radius $9$ cm and vertical height $12$ cm.
   Work out the total surface area of the cone.
   Give your answer correct to 3 significant figures. (Curved surface area of a cone $= \pi r l$, where $l$ is the slant height.)
3. Two cones are joined base-to-base to make a solid.
   Both cones have base radius $r$ cm.
   One cone has slant height $4r$ cm and the other has slant height $5r$ cm.
   The total curved surface area of the solid is $300\pi$ cm².
   Work out the value of $r$.
   Give your answer correct to 3 significant figures. (Curved surface area of a cone $= \pi r l$.)

1. A cone has a base diameter of $8$ cm and a vertical height of $8$ cm.
   Work out the volume of the cone.
2. A solid cone has base radius $9$ cm and vertical height $12$ cm.
   Work out the total surface area of the cone.
   Give your answer correct to 3 significant figures. (Curved surface area of a cone $= \pi r l$, where $l$ is the slant height.)
3. Two cones are joined base-to-base to make a solid.
   Both cones have base radius $r$ cm.
   One cone has slant height $4r$ cm and the other has slant height $5r$ cm.
   The total curved surface area of the solid is $300\pi$ cm².
   Work out the value of $r$.
   Give your answer correct to 3 significant figures. (Curved surface area of a cone $= \pi r l$.)