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Verified answer
MAPEL = MATEMATIKAKELAS = 8
BAB = LINGKARAN
diketahui :
- gambar A.
jari² lingkaran kecil (r1) = 7cm
jari² lingkaran besar (r2) = 7cm + 7cm = 14cm
- gambar B.
diameter ( d ) = 10,5cm
sisi persegi = 10,5cm
ditanya =
luas daerah arsir dari masing masing gambar??
-------- Bangun Datar Lingkaran -------
Gambar A.
luas O besar = πr²
= 22/7 × 14cm × 14cm
= 22/7 × 196cm²
= 616cm²
luas O kecil = πr²
= 22/7 × 7cm × 7cm
= 22/7 × 49cm²
= 154cm²
luas daerah arsir :
= luas O besar - luas O kecil
= 616cm² - 154cm²
= 462cm²
gambar B.
luas persegi = s²
= 10,5cm × 10,5cm
= 110,25cm²
luas O = ¼ × πd²
= ¼ × 22/7 × 10,5cm × 10,5cm
= 22/28 × 110,25cm²
= 86,625cm²
luas daerah arsir :
= Luas. persegi - Luas O
= 110,25cm² - 86,625cm²
= 23,625cm²
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