Regular polygon .

Question

Answer 1

Top angle of triangle is 60 degrees and lower left angle of triangle is 30. We have a 30-60-90 right triangle.

Apothem is side opposite 30 degree angle so it is 5 ft. Half of side of triangle is side opposite 60 degree angle so it is 5sqrt(3) feet. Perimeter is thus 15sqrt(3) feet. Area = 1/2*apotherm*perimeter.