Question

a triangle has a perimeter of 50cm. If its two sides are of length 15cm and 19cm, what us the lenght of the third side ?​

Answer 1

$\sf \: {Let \: the \: third \: side \: be \: x}$

$\sf{Perimeter \: of \: the \: triangle = 50 \: cm}$

Perimeter of the triangle = sum of length of 3 sides

$50cm = 19 + 15 + x$

$50 = 34 + x$

$x = 50 - 34$

$\therefore x = 16cm$

Answer 2

Answer:

ATQ,

Total perimeter = 50cm

First side = 15 cm

Second side = 19 cm

Therefore, Perimeter of triangle = Addition of length of 1st, 2nd and 3rd sides.

So, Length of first and second sides = (15+19)cm

= 34cm.

Hence, Length of third side = (50-34)cm = 16 cm.

So, 16 CM is the third side.

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