Question

$\huge \tt {Don't \: Spam \: please}$​

Answer 1

Answer:

So length = 12cm and 5 cm

So perimeter = l+l+l

=12+5+0

=17

$\huge \dag \sf{Answer \: is}$

a. 17 cm

Answer 2

Given: In a right angled triangle, the length of its two legs are 12 cm and 5 cm.

Let's say, that the other side of the triangle be n.

⠀

$:\longmapsto\sf\quad Third_{\:(side)} = \sqrt{First_{\:(side)} + Second_{\:(side)}}$

$:\longmapsto\sf\quad n = \sqrt{(12^2 + 5^2)}$

$:\longmapsto\sf \quad n = \sqrt{144 + 25}$

$:\longmapsto\sf\quad n = \sqrt{169}$

$\leadsto\quad{\pmb{\sf{n = 13}}}$

$\Therefore{\underline{\textsf{Hence, the third side of the triangle is \textbf{13 cm}.}}}$

⠀⠀━━━━━━━━━━━━━━━━━━━━━━━━━━━━━⠀

$\underline{\bf{\dag} \:\:\bf{Perimeter\; of\:the\;\triangle \: :}}$⠀⠀⠀⠀

$:\longmapsto\sf\quad Perimeter_{\;(triangle)} = Sum_{\:(1st + 2nd + 3rd)}$

$:\longmapsto\sf\quad Perimeter_{\;(triangle)} = 12 + 5 + 13$

$\leadsto\sf\quad\underline{\boxed{\pmb{\frak{Perimeter_{\;(triangle)} = 30}}}}$

$\Therefore{\underline{\textsf{Hence, the Perimeter of the triangle is \textbf{Option c) 30 cm}.}}}$