13.1 surface area and volume
You can find
13.1 Surface Area and volumes of Class 9 here http://teachoo.com/subjects/cbse-maths/class-9th/ch13-9th-surface-areas-and-volumes/
13.1 Surface Area and volumes of Class 10 here http://teachoo.com/subjects/cbse-maths/class-10th/ch13-10th-surface-areas-and-volumes/
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