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An isosceles triangle can be split up into two right angle triangles so use trigonometry to find the base and then double your answer to find the base of the isosceles triangle which works out as 57.12592026 meters.

Base = 20/tan(35) = 28.56296013

Base of isosceles = 28.56296013*2 = 57.12592026

Area = 1/2*base*height

Area = 1/2*57.12592026*20 = 571.2592026 square meters

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