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Verified answer
MAPEL = MATEMATIKAKELAS = 7
BAB = BANGUN DATAR
a.)
diketahui =
diameter/sisi = 14cm
jari jari = 7cm
ditanya = luas arsir??
luas persegi = S²
= 14cm × 14cm
= 196cm²
luas ½ lingkaran = ½πr²
= ½ × 22/7 × 7 × 7
= ½ × 154
= 77cm²
luas arsir :
= 196cm² - 77cm²
= 119cm²
b.)
diketahui =
diameter/sisi = 10cm
jari jari = 5cm
ditanya = luas arsir??
luas persegi = S²
= 10cm × 10cm
= 100cm²
luas lingkaran = πr²
= 3,14 × 5 × 5
= 3,14 × 25
= 78,5cm²
luas arsir :
= 100cm² - 78,5cm²
= 21,5cm²
semoga membantu
luas setengah lingkaran = 1/2×π×r^2
= 1/2×22/7×7×7= 77 cm2
jadi luas yg diarsir 196-77= 119 cm2
b. L persegi = 10×10= 100 cm2
L lingkaran = π×r^2 = 3,14×5×5= 78,5 cm2
jadi luas yg diarsir= 100-78,5= 21,5 cm2..
maaf kalo salah..