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A toy top, a tent, a medicine capsule. Each is two or more solids joined.

This is Chapter 12, Surface Areas and Volumes, in your book. In Class 9 you measured one solid at a time. Here two or more solids make one object.

What you will learn

• Two solids, one object. Name the basic solids in an object.
• Outside and inside. One object, two questions: area or volume.
• What the join hides. Parts that touch are not on the outside.
• The tent. Canvas, floor, air and price are four different answers.
• The hollow. A bowl cut out removes a flat mouth. It adds a curved bowl.
• The slant. Split the total height, then find the slant height.
• The job picks the faces. Read the question before you add.
• Start to finish. Solve a whole question in order.

Use π = 22/7 unless a question says otherwise.