Per NCERT Class 9 Math, what is the PERIMETER of a closed shape?
AThe number of vertices of the shape
BThe total length around its border — the distance an insect would travel walking once round the boundary
CTwice the length of the longest side
DThe area enclosed inside the shape
Answer & Solution
Correct answer: B. The total length around its border — the distance an insect would travel walking once round the boundary
NCERT defines perimeter as the total border length. Area is the enclosed region; the other options misstate it.
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