Question

Construct a rectangle has a width of $12$ cm, and a height of $5$ cm, what is its Perimeter?

• A. $30$ cm
• B. $32$ cm
• C. $42$ cm
• D. None of these

Answer 1

Answer: (D)

None of these

$\Rightarrow$ Draw a line segment $AB=12cm$

$\Rightarrow$ Construct an angle of ${90}^{\circ }$ at points $A$ and $B$.

$\Rightarrow$ Cut off $AD=5cm$ and $BC=5cm$.

$\Rightarrow$ Join $CD$.

$\Rightarrow$ Thus, $ABCD$ is a required rectangle.

$\Rightarrow$ Let $a=12cm$ and $b=5cm$

$\Rightarrow$ Perimeter of rectangle $ABCD=2(a+b)=2(12+5)=34cm$