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960 = 1/2 . 60 . d2
960 = 30 . d2
d2 = 960/30 = 32
s = √30²+16²
=√900 + 256
=√1156
= 34
keliling = 4.s
= 4.34
= 136
Luas Belah Ketupat = 960 cm²
diagonal 1 = 60 cm
Ditanya :
Keliling Belah Ketupat ... ?
Jawab :
⇔L = 1/2 diagonal 1 × diagonal 2
960 cm² = 1/2 · 60 · diagonal 2
960 cm² = 30 · diagonal 2
diagonal 2 = 960 ÷ 30
diagonal 2 = 32 cm
⇔rumus pythagoras :
s² = 30² + 16²
s² = 900 + 256
s² = 1.156
s = √1.156
s = 34
⇔keliling : 4s ⇒ 4 · 34 ⇒ 136 cm
Jadi, kliling belah ketupat tsb adl 136 cm.