4. While golfing, Victoria hits a tee shot from



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Bog'liq
the cosine law- word problems


NAME:____________________________

1. Aadil and Divya are driving South, in separate cars along the same road. After some time, Aadil and Divya reach a fork in the road. The road splits into two, which diverge at 59˚. Aadil chooses to travel South West at a speed of 72km/h. Divya travels South East at a speed of 81km/h. How far apart are Aadil and Divya after 2 hours and 45 minutes? Round your answer to the nearest tenth of a kilometer.

2. The Leaning Tower of Pisa is 55.9 m tall and leans 5.5˚ from the vertical. If its shadow is 90.0 long, what is the distance from the top of the tower to the top edge of its shadow? Assume that the ground around the tower is level. Round your answer to the nearest tenth of a metre.

3. The posts of a hockey goal are 2.0 m apart. A player attempts to score by shooting the puck along the ice from a point 6.5 m from one post and 8.0 m from the other. Within what angle θ must the shot be made in order for the player to score in the net? Round your answer to the nearest tenth of a degree.

4. While golfing, Victoria hits a tee shot from T toward a hole at H, but the ball veers 23˚ and lands at B. The scorecard says that H is 270 m from T. If Victoria walks 160 m to the ball (pointB), how far, to the nearest metre, is the ball from the hole?

5


A

B
. Two hot-air balloons are moored to level ground below, each at a different location. An observer at each location determines the angle of elevation to the opposite balloon as shown in the diagram. The observers are 2.0 m apart. What is the distance separating the balloons, to the nearest tenth of a kilometer?




80˚




20˚

25˚

75˚

2.0 km

6. Jordan flies his ultra-light airplane due east 100 km. He turns right through an angle of 130˚, and flies a second leg. The he turns right 110˚ and returns to her starting point. Using sine law and cosine law, determine the total length of the flight to the nearest kilometer.

7. Megan and Zahra live across a ravine from each other. Megan walked 180 m to the end of the ravine, turned right through an angle of 45˚, and walked another 200 m to Zahra’s house. What is the distance between the two houses? Round your answer to the nearest tenth of a metre.


SOLUTIONS



1. 208.3 km 2. 101.3 m 3. 10.5˚ 4. 138 m 5. 2.4 km 6. 274 km 7. 351.2 m

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