Question

The perimeter of a triangle is 75 cm two of the sides are 20cm and 30 cm find the third side

Answer 1

Answer:

Step-by-step explanation:given: perimeter of triangle=75

                                                          its two sides are 20,30

                                                          third side equal 20+30+x=75

                                                                                      50+x=75

                                                                                      x=75-50

                                                                                    x=25

                                             

Answer 2

Answer:

Step-by-step explanation:

Given :-

Sides of triangle = 20 cm and 30  cm

Perimeter of a triangle = 75 cm

To Find :-

The third side​

Formula to be used :-

Perimeter of triangle = a + b + c

Solution :-

Let it's third side be x.

⇒ Perimeter = a + b + c

⇒ 75 = 20 + 30 + x

⇒ 75 = 50 + x

⇒ 75 - 50 = x

⇒ 25 = x

Hence, the third side is equal to 25 cm.