Among the following options, which are NOT sides of a triangle?
Answer & explanation
Correct answer: option 4
Three sides form a triangle iff
Sum of length of two sides > Length of third side
A. 12 cm, 9 cm and 15 cm
( 12 + 9 ) > 15
21 > 15
B. 20 cm, 20 cm and 20 cm
( 20 + 20 ) > 20
40 > 20
C. 3 cm, 5 cm and 4 cm
( 3 + 5 ) > 4
8 > 4
D. 3 cm, 5 cm and 1 cm
( 3 + 1 ) > 5
4 is not greater than 5 .
Answer :- D. 3 cm, 5 cm and 1 cm