Question

20. A Perimeter of a triangle is 19 cm. The 1 po
length of 2 sides are 5 cm and 8 cm. Find
the third length.
04 cm
O 13 cm
O 6 cm
O 20 cm​

Answer 1

Answer:

Given,

Given, length of 2d Given, length of 2 sides 5cm , 8cm

now length of 3rd side suppose as x

now length of 3rd side suppose as x

and the given perimeter is 19

now = Perimeter of Triangle = 1st side + 19cm = 5cm + 8cm + x

19cm = 13cm + x

19cm - 13cm = x

x = 6cm

therefore the 3rd side will be 6 cm

Answer 2

In Triangle:

Perimeter = a + b  + c                                                       a = 5 cm

       19 cm = 5 + 8 + c                                                       b = 8 cm

       19 cm =   13 + c                                                          c = ?

( carry over 13 to 19. so it becomes 19 - 13)

          c      =   19 - 13

          c      =   6 cm

∴The length of third side is 6 cm