Jawaban:
7 cm
Penjelasan dengan langkah-langkah:
Garis singgung dalam (SD) = AB = 21 cm
Jarak antara titik pusat (JP) = MN = 29 cm
Jari-jari lingkaran besar (R) = AM = 13 cm
Jari-jari lingkaran kecil (r) = BN
SD² = JP² - (R+r)²
AB² = MN² - (AM + BN)²
21² = 29² - (13 + BN)²
441 = 841 - (13 + BN)²
(13 + BN)² = 841 - 441
(13 + BN)² = 400
(13 + BN) = √400
13 + BN = 20
BN = 20 - 13
BN = 7 cm
Diketahui :
R = 13 cm
p = 29 cm
d = 21 cm
Ditanyakan :
r = ?
Jawab :
( R + r )² = p² - d²
( 13 + r )² = 29² - 21²
( 13 + r )² = ( 29×29 ) - ( 21×21 )
( 13 + r )² = 841 - 841
( 13 + r )² = 400
13 + r = √400
13 + r = 20
r = 20-13
r = 7 cm
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Jawaban:
7 cm
Penjelasan dengan langkah-langkah:
Soal Garis Singgung Dalam Dua Lingkaran
Rumus : SD² = JP² - (R+r)²
Dik:
Garis singgung dalam (SD) = AB = 21 cm
Jarak antara titik pusat (JP) = MN = 29 cm
Jari-jari lingkaran besar (R) = AM = 13 cm
Dit:
Jari-jari lingkaran kecil (r) = BN
SD² = JP² - (R+r)²
AB² = MN² - (AM + BN)²
21² = 29² - (13 + BN)²
441 = 841 - (13 + BN)²
(13 + BN)² = 841 - 441
(13 + BN)² = 400
(13 + BN) = √400
13 + BN = 20
BN = 20 - 13
BN = 7 cm
Penyelesaian ✍️
Diketahui :
R = 13 cm
p = 29 cm
d = 21 cm
Ditanyakan :
r = ?
Jawab :
( R + r )² = p² - d²
( 13 + r )² = 29² - 21²
( 13 + r )² = ( 29×29 ) - ( 21×21 )
( 13 + r )² = 841 - 841
( 13 + r )² = 400
13 + r = √400
13 + r = 20
r = 20-13
r = 7 cm