100 Great Children's Picturebooks

100 Great Children's Picturebooks

Matematika 1. brp nilai dari cos 150° =......
2. nyata kan dalam satuan derajat 3/4 π rad = ......​

1. brp nilai dari cos 150° =......
2. nyata kan dalam satuan derajat 3/4 π rad = ......​

1. Cos 150°

= Cos (180° - α)

= Cos ( 180° - 30°)

= - Cos 30°

= [tex]\frac{1}{2}\sqrt{3}[/tex]

2. [tex]\frac{3}{4}\pi[/tex] radian

= [tex]\frac{3}{4}\pi[/tex] x [tex]\frac{180}{\pi }[/tex]

= 3 x 45

= 135°

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