kak tolong pakai caranya yak:)

[tex] ac \: = \sqrt{ad {}^{2} + dc {}^{2} } [/tex]
[tex]ag \: = \sqrt{ac {}^{2} + cg {}^{2} } [/tex]
[tex]ac \: = \sqrt{720} [/tex]
[tex]ag \: = \sqrt{720 + 64 } [/tex]
[tex]ag \: = \sqrt{784} [/tex]
[tex]ag \: = 28[/tex]