Question

Find the length of the diagonal of a rectangle whose sides are 21cm and 20cm

Answer 1

Answer:

Let the diagonal be x cm

so, by Pythagoras theorem,x^2=21^2+20^2

x^2=441+400

x=√841

=29

therefore, length of the diagonal is 29 cm

Answer 2

Answer:

29

Step-by-step explanation:

diagonal of a rectangle = √l²+b²

√20²+21²=√841 = 29