Homework Quiz:

From a window 30.0 ft above the street, the angle of elevation to the top of the building across the street is 50.0o and the angle of depression to the base of this building is 20.0o. Find the height of the building across the street.

10.3.12Monday, October 01, 20129:13 AM

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Solving a problem involving bearing

** This is EXACTLY OPPOSITE of the way angles are measured on the coordinate plane **

Radar stations A and B are on an east-west line, 8.6km apart. Station A detects a plane at C, on a bearing of 53 degrees. Station B simultaneously detects the same plane, on a bearing of 323 degrees. Find the distance from B to C

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Solving a problem involving Bearing

The bearing form A to C is N 64o W. The bearing from A to B is S 82o W. The bearing from B to C is N 26o E. A plane flying at 350 mph takes 1.8 h to go from A to B. Find the distance from B to C

Practice: p. 542 #48

plane, on a bearing of 323 degrees. Find the distance from B to C

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to B. Find the distance from B to C

Practice: p. 543 #52

Solving a problem involving angles of elevation:

Marla needs to find the height of a building. From a given point on the ground, she finds that the angle of elevation to the top of the building is 74.2o. She then walks back 35 ft. From the second point, the angle of elevation to the top of the building is 51.8o. Find the height of the building.

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Practice: p. 543 #56

pp. 542-544 #47-59 odd Homework: Read pp. 534-38

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