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RRB Group-D Model Paper 14 with answers for online practice
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© examsnet.com
Question : 89
Total: 100
The diagonal of a square is
10
√
2
cm, find its perimeter?
160 cm
80 cm
20 cm
40 cm
Validate
Solution:
As seen from the above figure,
The diagonal AC =
10
√
2
Now ABC forms a right angled triangle with AB = BC
By Pythagoras theorem,
A
B
2
+
B
C
2
=
A
C
2
2
A
B
2
=
100
×
2
A
B
2
=
100
AB = 10
Perimeter of a square = 4 AB = 40 cm
© examsnet.com
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