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keliling = 20 cm
diagonal 1 = 8 cm
jawab :
kll = 4s
20 cm = 4s
20 cm /4 = s
s = 5cm
1/2diagonal 2 =√ s² - 1/2diagonal 1²
1/2diagonal 2 = √ (5cm)² - ( 4 cm )²
1/2diagonal 2 = √25cm² - 16cm²
1/2diagonal 2 = √ 9 cm²
1/2digonal 2 = 3 cm
diagonal 2 = 6 cm
luas belah ketupat = 1/2 X d1 X d2
1/2 x 8 cm² x 6 cm²
luas belah ketupat = 24 cm²