According to the Question
It is given that,
we have to calculate the perimeter of the rectangle .
Firstly we calculate the breadth of rectangle .
On substituting the value we get
↠ 21 = 3 × breadth
↠ 21/3 = breadth
↠7 cm = breadth
Now, calculating the perimeter of rectangle .
Perimeter of Rectangle = 2(length+breadth)
↠ Perimeter of Rectangle = 2(3+7)
↠ Perimeter of Rectangle = 2 ( 10)
↠ Perimeter of Rectangle = 20cm
Additional Information !!
[tex]\begin{gathered}\boxed{\begin {array}{cc}\\ \quad \Large\underline{\bf Formulas\:of\:Areas:-}\\ \\ \star\sf Square=(side)^2\\ \\ \star\sf Rectangle=Length\times Breadth \\\\ \star\sf Triangle=\dfrac{1}{2}\times Breadth\times Height \\\\ \star \sf Scalene\triangle=\sqrt {s (s-a)(s-b)(s-c)}\\ \\ \star \sf Rhombus =\dfrac {1}{2}\times d_1\times d_2 \\\\ \star\sf Rhombus =\:\dfrac {1}{2}d\sqrt {4a^2-d^2}\\ \\ \star\sf Parallelogram =Breadth\times Height\\\\ \star\sf Trapezium =\dfrac {1}{2}(a+b)\times Height \\ \\ \star\sf Equilateral\:Triangle=\dfrac {\sqrt{3}}{4}(side)^2\end {array}}\end{gathered}[/tex]
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Step-by-step explanation:
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Verified answer
According to the Question
It is given that,
we have to calculate the perimeter of the rectangle .
Firstly we calculate the breadth of rectangle .
On substituting the value we get
↠ 21 = 3 × breadth
↠ 21/3 = breadth
↠7 cm = breadth
Now, calculating the perimeter of rectangle .
Perimeter of Rectangle = 2(length+breadth)
On substituting the value we get
↠ Perimeter of Rectangle = 2(3+7)
↠ Perimeter of Rectangle = 2 ( 10)
↠ Perimeter of Rectangle = 20cm
Additional Information !!
[tex]\begin{gathered}\boxed{\begin {array}{cc}\\ \quad \Large\underline{\bf Formulas\:of\:Areas:-}\\ \\ \star\sf Square=(side)^2\\ \\ \star\sf Rectangle=Length\times Breadth \\\\ \star\sf Triangle=\dfrac{1}{2}\times Breadth\times Height \\\\ \star \sf Scalene\triangle=\sqrt {s (s-a)(s-b)(s-c)}\\ \\ \star \sf Rhombus =\dfrac {1}{2}\times d_1\times d_2 \\\\ \star\sf Rhombus =\:\dfrac {1}{2}d\sqrt {4a^2-d^2}\\ \\ \star\sf Parallelogram =Breadth\times Height\\\\ \star\sf Trapezium =\dfrac {1}{2}(a+b)\times Height \\ \\ \star\sf Equilateral\:Triangle=\dfrac {\sqrt{3}}{4}(side)^2\end {array}}\end{gathered}[/tex]
Answer:
YOUR ANSWER
Step-by-step explanation:
HOPE IT HELPED YOU HUHH!!