CK-12 Geometry-Concepts

http://www.ck12.org Chapter 8. Right Triangle Trigonometry

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CK-12 Foundation: Chapter8TrigonometricRatioswithaCalculatorB

Concept Problem Revisited

Use trigonometric ratios to find the missing sides. Round to the nearest tenth.

Find the length ofaandbusing sine or cosine ratios:

cos 20◦=

a

10

sin 70◦=

a

10

10 ·cos 20◦=a 10 ·sin 70◦=a

a≈ 9. 4 a≈ 9. 4

sin 20◦=

b

10

cos 70◦=

b

10

10 ·sin 20◦=b 10 ·cos 70◦=b

b≈ 3. 4 b≈ 3. 4