Question

Find the length of the third side of a triangle if its perimeter is 23 cm and two of its sides measure 5 cm and 10 cm .​

Answer 1

Answer:

Let the 3 side of triangle be x

Perimeter of triangle = 23 cm.

Third side = 5 + 10 + x = 23

50 + x = 23

50 - 23 = x

17 = x

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Answer 2

Refer the attachment for figure.

Step-by-step explanation:-

$we \: know \: that \: ABC \: is \: a \: triangle \\ in \: which \\ AB = 5cm \\ BC = 10cm \\ AC = \: ? \\ perimeter \: of \: triangle \: = \:23cm \\ \implies \: AB + BC + AC = 23cm \\ \implies \: 5cm + 10cm \: + \: AC = \: 23cm \\ \implies15 \: + AC \: = 23cm \\ \implies \: AC = 23 - 15 \\ \therefore AC = 8cm.$