Question

(5) Find the length of the third side of a triangle if its perimeter is 20 cm and
two of its sides measure 3.5 cm and 9 cm.​

Answer 1

Answer:

parameter of triangle=sum of all sides of triangle...

Step-by-step explanation:

12.5+x=20

x=20-12.5=7.5

Answer 2

Answer:

31.5 answer

.............