Free Printable 4.1 Exploring the primary trig ratios of obtuse angles

Worksheets

Name

Class

Date

Which one of the following equations is valid?

sin 45° = –sin 135°

sin 45° = sin 135°

sin 45° = –sin 45°

none of the above

Calculate tan 25° to four decimal places. Predict another term that equals tan 25°.

0.4663; –tan 155°

0.4663; tan 155°

–0.4663; tan 155°

–0.4663; –tan 155°

Find two possible angles between 0^o and 180^o such that sinθ = 0.42 (i.e. which two angles have the sine ratio 0.42?).

25^o

42^o

155^o

138^o

Which of the following equations is true?

sin 35^o = sin 135^o

sin 35^o = sin 155^o

sin 35^o = sin 145^o

sin 35^o = - sin 145^o

Which of the following equations is false?

sin 55^o = sin 125^o

cos 55^o = - cos 125^o

tan 55^o = - tan 125^o

sin 55^o = - sin 125^o

100 %

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