Question

Q. 1. The perimeter of one face of a cube is 40 cm. Find the sum of length of
its edges.
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Answer 1

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Let length of one edge of the cube is a

Perimeter of one face of a cube is 40 cm

4a = 40

a = 40/4

a = 10cm

length of one edge = 10 cm

no of edge in a cube = 12

sum of length of all the edges of cube =12 × 10cm = 120cm.

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Answer 2

Answer:

We know that,

cube has 6 faces...

1face=40cm

then,6 face = (40×6)cm

=240cm..

6 face = the sum of all edges = 240cm...