Question

find the perimeter of: a square of side 9 metre (b) a rectangle of length 12 cm and breadth 8 cm (c) a triangle of side 10 cm 8 cm and 7 cm what is the answer of these three parts​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

$\huge\underline\mathrm{Solution:}$

a)Given,

• Side of a square = 9 m
• Perimeter of square = ?

We know that,

${\boxed{\bold{Perimeter\:of\:square=4\times Side}}}$

$\rightarrow\sf Perimeter = (4 \times 9)\:m \\\\\rightarrow{\boxed{\sf\green{Perimeter = 36\:m}}}$

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b) Given,

• Length of rectangle = 12 cm
• Breadth of rectangle = 8 cm
• Perimeter of rectangle = ?

We know that,

${\boxed{\bold{Perimeter\:of\:rectangle=2(length + breadth)}}}$

$\rightarrow\sf Perimeter = 2(12 + 8)\:cm \\\rightarrow\sf Perimeter = (2\times 20)\:cm \\\\\rightarrow{\boxed{\sf\green{Perimeter = 40\:cm}}}$

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c) Given,

• Sides of triangle=10 cm, 8 cm,7 cm
• Perimeter of triangle = ?

We know that,

${\boxed{\bold{Perimeter\:of\: \triangle=Sum\:of\:sides\:of \: \triangle}}}$

$\rightarrow\sf Perimeter = (10 + 8 + 7)\:cm \\\\\rightarrow{\boxed{\sf\green{Perimeter=25\:cm}}}$