Tolong nomer 28 beserta caranya yg lengkap ya, kalo di kunci jawaban, jawabannya c
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Jarak = 30 cm
GSPD = 24 cm
Rkecil = ...?
GSPD² = Jarak² - (Rbesar + Rkecil)²
GSPD = √Jarak² - (Rbesar + Rkecil)²
24 = √30² - (14 + R)²
√576 = √900 - (14 + R)²
900 - (14 - R)² = 576
- (14 + R)² = 576 - 900
- (14 + R)² = -324
(14 + R)² = 324
14 + R = √324
14 + R = 18
R = 18 - 14
R = 4 cm