Which three lengths could be the lengths of the sides of a triangle?

A. 11cm, 11cm, 24cm
B. 18cm, 12cm, 9cm
C. 9cm, 19cm, 10cm
D. 4cm, 7cm, 23cm

Question

Which three lengths could be the lengths of the sides of a triangle?

A. 11cm, 11cm, 24cm
B. 18cm, 12cm, 9cm
C. 9cm, 19cm, 10cm
D. 4cm, 7cm, 23cm

fortytherapper · Answer

The rule is: The two shortest sides added together must be LARGER than the larger side.

For example:

4 cm, 5 cm, 8 cm

The two shortest are 4 and 5

4+5 is 9 and 9 is greater than 8, so it works

---------------------------------------
4cm, 5cm, 10cm

The two shortest are 4 and 5

4+5 = 9 and 9 is less than or equal to 10, so it doesn't work

anonymous · Answer

oh! thank you. so the answer is B because 12+9=19 and the longest side is 18?