Question 1194050
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You have  (30°-60°-90°) right angled triangle.


Its hypotenuse is c = 40 ft (given).


Its longer leg is  {{{c*(sqrt(3)/2)}}} = {{{40*(sqrt(3)/2)}}} ft.   Use your calculator to get the value.


Its shorter leg is  half the hypotenuse, i.e. 40/2 = 20 ft.
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Solved and explained.