题目内容：

1.What is the measure of one exterior angle of a regular polygon having 40 sides?
2.To the nearest thousandth,what is tan (77o)
3.When the angle of elevation to the sun is 26o,a flagpole casts a shadow that is 82 feet long.What is the height of the flagpole to the nearest foot?
9
4.What is the value of ∑ 2k – 3
k = 4
5.1.Find the sum of the infinite geometric series:3 + 1.8 + 1.08 + 0.648 + …

优质解答

1.9°（正四十边型的外角度数）
2.4.331 （tan77°的精确到千分位的数字）
3.tan26*82=40.0 feet（仰角26°,旗杆投影82英尺）
4.from 4 to （求和）
5+7+9+11+13+15=60
5.7.5 （等比数列无穷项和）