Question

find the length of a diagonal of the square whose side is 10 cm​

Answer 1

Answer:

length of diagonal of square=√2a

a=10

√2×10

=4.47214 or 2√5

Answer 2

Answer:

Step-by-step explanation:

length of diagonal of square with side 10cm

let the length of diagonal be x cm

then, by Pythagoras theorem,

x² = (10)² +( 10)²

x² = 100+100

x² = 200

x  = $\sqrt{200}$

 x  = 10$\sqrt2}$

hence the length of diagonal is 10$\sqrt{2}$cm