r = d : 2 = 10,5 cm : 2 = 5,25 cm
Luas setengah lingkaran
= ½ × π × r²
= ½ × 3,14 × 5,25 cm × 5,25 cm
= 43,273 cm²
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r = d : 2 = 10,5 cm : 2 = 5,25 cm
Luas setengah lingkaran
= ½ × π × r²
= ½ × 3,14 × 5,25 cm × 5,25 cm
= 43,273 cm²