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AO = √400 -144
AO = √256
AO = 16
CO = √13² - 12²
CO = √169 - 144
CO = √25
CO = 5
AO = 21 cm
Luas layang-layang = d1 × d2 ÷ 2
= 24 × 21 ÷ 2
= 252 cm²
= 1/2 . 20 cm . 24 cm
= 1/2 . 480
= 240 cm