Ex 13.1, 7 is https://www.teachoo.com/1314/467/Ex-13.1--7---Shanti-Sweets-Stall-was-placing-an-order-for/category/Ex-13.1/
and Ex 13.1, 8 is https://www.teachoo.com/1315/467/Ex-13.1--8---Praveen-wanted-to-make-a-temporary-shelter/category/Ex-13.1/
To study Chapter 13 Class 9, visit https://www.teachoo.com/subjects/cbse-maths/class-9th/ch13-9th-surface-areas-and-volumes/
To learn CBSE Maths from Class 9 to 11, please visit teachoo.com/maths
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