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Verified answer
Luas segitiga = 1/2 x 21 x 21 = 220,5 cmLuas juring = 90/360 x 22/7 x 21² = 1/4 x 1364 = 346,5 cm²
luas daerah terarsir = 346,5 - 220,5 = 126 cm²
a² +c² =b²
boleh juga
c² =b²-a² atau a² = b² -c²