Question

If one triangles two line are add then that two lines value greater than last one line. why
answer me with prove ​

Answer 1

sum of any 2 sides of a triangle is greater than the 3rd side.

Step-by-step explanation:

consider triangle ABC,

we need to prove that sum of any 2 sides is greater than the 3rd side, so weneed to show that

AB+AC>AC

proof-

letus extend BA to point D, such that

AD=AC.

in triangle DAC we have

AD=AC(by construction )

so <ACD=<ADC

in triangle DBC,

<DCB=<DCA+<ACB

or

<DCB=<ADC+<ACB

or

<DCB> <ADC.