Question

two sides of triangle measure 7 cm and 5 cm . find the length of the third side of the perimeter of the triangle is 20​

Answer 1

Answer:

8 cm.

Step-by-step explanation:

Perimeter of a Δ = 3 × side or side + side + side

Given: two sides of the Δ of measures 7 cm and 5 cm respectively.

Let the required number be x.

Then, (7 + 5 + x) cm = 20 cm

⇒ x = 20 - 12

⇒ x = 8

And, (7 + 5 + 8) cm = 20 cm

-$Shahrin$ $Khan$

Answer 2

Answer:

8cm

Step-by-step explanation:

Length of 1st side = 7cm

Length of 2nd side = 5cm

Let us assume the length of 3rd side be 'x' cm

= Perimeter of triangle = Side + side + side

20 = 7 + 5 + x

20 - 12 = x

8 = x

Length of 3rd side = 8cm