1.

The perimeter of a triangle is 52 cm . two of its sides are 17 and 18 cm respectively . find the length of the thired side of a triangle . ​

Answer» GIVEN :-

Perimeter of the triangle = 52 cm

First side of the triangle = 17 cm

Second side of the triangle = 18 cm

To Find :-

The length of the third side of a triangle.

Analysis :-

Substitute the given values in the formula of perimeter of a triangle.

Then you can EASILY find the third angle.

Solution :-

By the formula,

\underline{\boxed{\sf Perimeter \ of \ a \ triangle=a+b+<klux>C</klux>}}

Given that,

Side a = 17 cm

Side b = 18 cm

Perimeter = 52 cm

Substituting their values,

52 = 17 + 18 + c

52 = 35 + c

By TRANSPOSING,

c = 52 - 35

c = 17 cm

Therefore, the sides of the triangle are 17 cm, 18 cm and 17 cm.


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