Question

Two sides of a triangle measure 10cm and 18cm . Which could be the measure of the third side of the triangle?

Answer 1

It cannot be 30, because the sum of two sides should be more than third side
-not D
10+18=28 <30

it cannot be 6 +10 < 18

it cannot 8
8+10=18

so it is has to be C) 12
12+18>10
10+12>18
10+18>12
answer  C. 12 cm