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=
=
=
= 20√6 cm
gspd =
=
= √1600
= 40 cm
3) gspd² = d² - (R + r)²
24² = 30² - (10 + r)²
(10 + r)² = 30² - 24²
(10 + r)² = 900 - 576
(10 + r)² = 324
10 + r = √324
10 + r = 18
r = 18 - 10
r = 8 cm
L1 : L2 = π.R² : π.r²
= R² : r²
= 10² : 8²
= 100 : 64
= 25 : 16
untuk soal B2....maaf tak terselesaikan ,krn panjang garis singgungnya > jarak pusat lingkaran