# Cotangens - problems

1. Regular 5-gon Calculate area of the regular pentagon with side 7 cm.
2. Building How high is the building that throws horizontal shadow 95.4 m long at angle 50°?
3. Q-Exam If tg α = 0.9, Calculating sin α, cos α, cotg α .
4. Aircraft The plane flies at altitude 6500 m. At the time of first measurement was to see the elevation angle of 21° and second measurement of the elevation angle of 46°. Calculate the distance the plane flew between the two measurements.
5. Angle A straight line p given by the equation ?. Calculate the size of angle in degrees between line p and y-axis.
6. Tree Between points A and B is 50m. From A we see a tree at an angle 18°. From point B we see the tree in three times bigger angle. How tall is a tree?
7. How far From the top of a lighthouse 145 ft above sea level, the angle of depression of a boat 29°. How far is the boat from the lighthouse?
8. Pilot How high is the airplane's pilot to see 0.001 of Earth's surface?
9. Depth angle From a cliff of 150 meters high, we can see the ship at a depth angle of 9° at sea. How far is the ship from the cliff?
10. KLM triangle Find the length of the sides of the triangle KLM if m = 5cm height to m = 4.5 cm and size MKL angle is 70 degrees.
11. Balloon and bridge From the balloon, which is 92 m above the bridge, one end of the bridge is seen at a depth angle of 37° and the second end at depth angle 30° 30 '. Calculate the length of the bridge.

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