Question

the sides of a rectangle are 5 cm and 12 cm long. find its diagonal​

Answer 1

Let A be 5cm

And

B be 12 cm

Therefore, A^2+B^2=C^2(According to Pythagoras Theorem)

So,

(5)^2+(12)^2=25+144=169

C^2=169

Therefore, C=13 cm

Hope it helps you

Answer 2

Answer:

diagonal of a rectangle =

$\sqrt{ {l}^{2} } + \sqrt{ {b}^{2} }$

diagonal=

$\sqrt{ {5 }^{2} } + \sqrt{ {12}^{2} }$

root25+144

$\sqrt{169}$

Diagonal= 13cm