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Question

The red line slices the cuboid horizontally from the centre as shown. Choose the value from the given options which does not represent the perimeter of any face after slicing.


A
10 cm
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B
14 cm
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C
15 cm
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D
16 cm
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Solution

The correct option is C 15 cm
We know, perimeter of a
rectangle = 2×(l+w)

The 3 possible faces and the perimeter obtained on slicing the given cuboid horizontally along the red line are given below:

Face 1 : Perimeter = 2×(5+3)=16 cm


Face 2 : Perimeter = 2×(5+2)=14 cm


Face 3 : Perimeter = 2×(2+3)=10 cm


So, the perimeter of a face after slicing can't be 15 cm.

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