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luas lingkaran=π×r×r=22/7×7×7=154
luas yang diarsir=49-154=(-105)
maaf kalau salah
= 7 x7
= 49 cm²
*Mencari luas 1/2 lingkaran (besar) = 1/2 x π x r²
= 1/2 x 3,14 x (7 : 2)²
= 1/2 x 3,14 x 3,5²
= 1/2 x 3,14 x 12,25
= 1,57 x 12,25
= 19,23 cm²
*Mencari 2 luas 1/4 lingkaran (kecil) = 1/4 x π x r²
= 2 x 1/4 x 3,14 x (3,5 : 2)²
= 2 x 1/4 x 3,14 x 1,75²
= 2 x 1/4 x 3,14 x 3,0625
= 2 x 1/4 x 9,61625
= 2 x 2,4
= 4,8 cm²
Luas Persegi - Luas 1/2 lingkaran - 2 luas 1/2 lingkaran
= 49 cm² - 19,23 cm² - 4,8 cm²
= 29,77 cm² - 4,8 cm²
= 24,97 cm²
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