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Geometry B Bellwork 3) Using the inverse of tangent Find m N to the nearest degree. tan N = = m N = tan -1 (0.6) m N ≈ 31° N RX 30 18 30 0.6

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9-2 Sine and Cosine Ratios

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sin A =opposite side hypotenuse sin A = a c B c a C b A

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cos A =adjacent side hypotenuse cos A = b c B c a C b A

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EX. Write the sine and cosine ratio for A and B. sin A = cos A = sin B = cos B = A B C 8 17 15

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Before starting this problem change your calculator mode to degrees EX 2. Find the value of w to the nearest tenth cos = 5.1≈ w w 32° 6 w 6 (6)cos 32°=w 1 CROSS MULTIPLY

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Before starting this problem change your calculator mode to degrees Ex 3. Find the value of w to the nearest tenth sin = 7.1 ≈ w w 52° 9 w 9 (9)sin52°=w 1 CROSS MULTIPLY

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Before starting this problem change your calculator mode to degrees OYO….Find the value of w to the nearest tenth sin = 8.6 ≈ w w 46° 12 46° w 12 (12)sin46°=w 1 CROSS MULTIPLY

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Before starting this problem change your calculator mode to degrees EX 4. Find the value of w to the nearest tenth cos = w ≈ 10.7 w 62° 5 5 w cos62°(w)= 5 1 cos62 ° CROSS MULTIPLY

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Before starting this problem change your calculator mode to degrees OYO. Find the value of w to the nearest tenth sin = w ≈10.3 w 43° 7 7 w sin43°(w)= 7 1 sin43°Sin 43° CROSS MULTIPLY

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EX. 5 Using the inverse of tangent Find m X to the nearest degree. cos X = = m X = cos -1 ( ) m X ≈ 55° N RX 14 8 8 14 0.571428571

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OYO….Using the inverse of tangent Find m X to the nearest degree. sin X = = m X = sin -1 ( ) m X ≈ 43° N RX 19 13 19 0.684210526

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9-2 Sine and Cosine Ratios. There are two more ratios in trigonometry that are very useful when determining the length of a side or the measure of an.

9-2 Sine and Cosine Ratios. There are two more ratios in trigonometry that are very useful when determining the length of a side or the measure of an.

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