JAMB - Mathematics (1991 - No. 30)
The area of a square is 144 sq cm. Find the length of its diagonal
11\(\sqrt{3cm}\)
12cm
12\(\sqrt{2cm}\)
13cm
คำอธิบาย
BD = \(\sqrt{x^2 + x^2}\)
= \(\sqrt{12^2 + 12^2}\)
= \(\sqrt{144 + 144}\)
= 2(144)
= 12\(\sqrt{2cm}\)
= \(\sqrt{12^2 + 12^2}\)
= \(\sqrt{144 + 144}\)
= 2(144)
= 12\(\sqrt{2cm}\)