Key measurements first
Key measurements first

A sphere is perfectly round, and a cone has a circular base and a single point. In both shapes, the radius rrr is the key measurement, while a cone also uses vertical height hhh and sometimes slant height lll.
Step-by-step lessons on CCEA GCSE Maths Spheres and Cones. Each one builds up to exam-style questions. Build fluency with number, ratio and algebra first, since geometry, probability and statistics topics rely on them, and leave extra time nearer the exam for Higher-tier problem-solving and multi-step reasoning questions.