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Diagonal 1 = 10
1/2 diagonal 2 = √sisi miring² - 1/2 diagonal1²
1/2 dig2= √13² - 5² = √169-25 = √144 = 12
maka panjang diagonal 2 adalah = 2 x 12 = 24 cm
Rumus luas belah ketupat = 1/2 x dig1 x dig2
= 1/2 x 10 x 24
= 120
Jadi luas belah ketupat tsb adalah 120 cm²