Question

the diagonal of a square of side 10 cm is?​

Answer 1

Answer:

$10\sqrt{2}$ cm

Step-by-step explanation:

Step 1)  we suppose that a square is made of two right angled triangles

Step 2) Then we can use pythagoras theorem

Step 3 ) lets consider one triangle

 here two sides will be of length 10cm

 then the diagonal of square will be hypotenuse of triangle

Step 4) So

$10^{2} + 10^{2} = x^{2}$

$x^{2} = 100 + 100$

$x = \sqrt{200} \\x = 10\sqrt{2} cm$