Section 9.8 Trigonometric Ratios Smaller Triangle: Larger Triangle: Smaller Triangle: Larger Triangle: Smaller Triangle: Larger Triangle:

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Presentation transcript:

Section 9.8 Trigonometric Ratios

Smaller Triangle: Larger Triangle: Smaller Triangle: Larger Triangle: Smaller Triangle: Larger Triangle:

Key Concept: Ratios formed by similar sides of similar triangles are equivalent.

Trigonometric Ratio A ratio of the lengths of two sides of a right triangle. AB C

How do I remember this? SOHCAHTOA AB C

Find sin A Find cos A Find tan A SOHCAHTOA

Find sin B Find cos B Find tan B SOHCAHTOA

Find the value on a calculator to the nearest ten thousandth.

sin 19° cos 51° tan 24° a.sin 63° b.cos 14° c.tan 41° Answer: Answer: Answer:

Find the missing measure. Round to the nearest tenth. SOHCAHTOA

Find the missing measure. Round to the nearest tenth. SOHCAHTOA

Architecture A tourist visiting the Petronas Towers in Kuala Lumpur, Malaysia, stands 261 feet away from their base. She looks at the top at an angle of 80° with the ground. How tall are the Towers? SOHCAHTOA

Homework Practice 9.8