Question

A square pane of glass has sides of 15cm. How long is its diagonal?

Answer 1

Use the Pythagorean Theorem as I showed you in your last post.

Answer 2

Diagonal:

d=sqroot(a^2+a^2)

d=sqroot(2*a^2)

d=sqroot(2)*a

a=15cm

d=1.41421*15 Becouse sqroot(2)=1.41421

d=21.21315 cm