Which set of side will make a triangle

a. 1cm, 3cm, 1cm

b. 5cm, 2cm, 3cm

c. 10cm, 3cm, 4cm

d. 10cm, 5cm, 9cm

d. 10cm, 5cm, 9cm

Step-by-step explanation:

In a triangle, the length of each side must be between the difference and the sum of the lengths of the other sides.

a. 1 + 1 = 2; 2 < 3 Answer: no

b. 2 + 3 = 5; 5 = 5 Answer: no

c. 10 - 3 = 7; 7 > 4 Answer: no

d. 10 + 5 > 9

5 + 9 > 10

10 + 9 > 5

10 - 5 < 9

10 - 9 < 5

9 - 5 <10

Answer: yes