Question

The sides of a  are 3 cm, 4 cm and 5 cm. Its semi – perimeter is

(a) 6 cm (b) 8 cm (c) 10 cm (d) None​

Answer 1

Answer:

6cm will be the answer

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Answer 2

$</p><p></p><p>\sf Perimeter = sum \: of \: all \: sides </p><p></p><p>\\ \\</p><p></p><p> \sf \rightarrow \quad P = 3 + 4 + 5</p><p>\\ \\</p><p> \sf \rightarrow \quad P = 12 \: cm</p><p></p><p>\\ \\</p><p>\sf Also,</p><p>\sf semi-perimeter = \frac{Perimeter}{2} </p><p></p><p>\\ \\</p><p></p><p> \sf \rightarrow \quad s = \frac{P}{2} </p><p></p><p>\\ \\</p><p></p><p>\sf \rightarrow \quad s = \frac{12}{2} </p><p></p><p>\\ \\</p><p></p><p> \sf \rightarrow \quad s = 6 \: cm</p><p></p><p>\\ \\</p><p></p><p>\sf Option \: (A) \quad 6 \: cm</p><p></p><p>$