Question

A rectangular television screen has a width of 21 cm and a height of 20cm.Work out the length of the diagonal of the screen.

Answer 1

Step-by-step explanation:

according to Pythagoras theorem,

(diagonal)^2=(width)^2+(height)^2

(diagonal)^2=(21)^2+(20)^2=441+400

(diagonal)^2=841

diagonal=√(841)=29cm

so, length of diagonal is 29 cm

thanks