Jawab:

Yg salah itu b. Harusnya 3/8 putaran

Sisanya betul

Penjelasan dengan langkah-langkah:

π rad = 180° = 1/2 putaran

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a. 5/9 putaran

π/(1/2) = x/(5/9)

x = (5π/9)/(1/2)

x = 2(5π/9)

x = 10π/9 rad [BETUL]

--------------------------------

π/180 = (10π/9)/x

x = 180(10π/9)/π

x = (1800π/9)/π

x = 1800π/9π

x = 200° [BETUL]

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(b.) 135°

π/180 = x/135

x = 135π/180

x = 3π/4 rad [BETUL]

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π/(1/2) = (3π/4)/x

x = (1/2)(3π/4)/π

x = 3π/8π

x = 3/8 putaran [berarti 5/8 SALAH]

=====================

(c) 2.4π rad

π/(1/2) = 2.4π/x

x = (2.4π/2)/π

x = (2.4π/2π)

x = 1.2 = 6/5 putaran [BETUL]

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180/(1/2) = x/(6/5)

x = (180(6/5))/(1/2)

x = 2(36(6))

x = 432° [BETUL]

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