Question

1.
Two sides of a ∆ are 15cm and 19cm. The perimeter of the ∆ is
45cm. What will be the third side ?​

Answer 1

Answer:

11 cm

Step-by-step explanation:

sum of all three sides = 45 cm

length of two sides = 15 and 19 cm

third side = perimeter - two sides = 45 - 34

=11 cm

Answer 2

Step-by-step explanation:

let a=15 cm

b=19 cm

perimeter=45 cm

c=?

we know that,

perimeter of triangle=a+b+c

45=15+19+c

c=45-15-19

c=45-34

c=11 cm