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)=16cm
Face 2 : Perimeter =2×(5+2)=14cm
Face 3 : Perimeter =2×(2+3)=10cm
So, the perimeter of a face after slicing can't be 15 cm.