Question

19. Find the third side of the triangle if perimeter
of a triangle is 20 cm and sum of its two sides are 9
cm​

Answer 1

Step-by-step explanation:

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Answer 2

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Step-by-step explanation:

$let \: 1st \: side \: be \: a \: \\ 2nd \: side \: be \: b \\ and \: third \: side \: be \: c \\ sum \: of \: 2 \: sides \: of \: triangle(a + b) = 9cm \\ therefore : \\ perimeter of \: triangle \\ a + b + c = 20cm \\ 9cm + c = 20cm \\ c = 20cm - 9cm \\ c = 11cm \\ third \: side = 11cm$

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