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2. 3 + 6 + 6 + (1/2.2.3 = 3) = 18 cm
rumus yg no1 = (sisi x sisi) + (setengah x phi x jari jari x jar jari)
setengahnya karena setengah lingkaran
rumus yg no2 = sisi + sisi + sisi + (1/2 x tinggi segitiga x alas segitiga)