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66-(13+13) /2= 20 cm
misal titik tengah adalah O,
maka AO = √13²-12² = √169-144 = √25 = 5 cm
OC = √20²-12² = √400-144= √256 = 16 cm
jadi diagonal AC 16 cm + 5 cm = 21 cm
jadi, Luas = 1/2 × diagonal AC ×diagonal BD = 1/2 × 21×24 = 252cm²
segitiga 1 = 1/2 x 24 x 5 = 60
segitiga 2 = 1/2 x 24 x 16 = 192
maka 192 + 60 = 252 cm persegi