exam Maths Puzzle Numerical Ability

An arch is semi-elliptical with a base that is 20 feet wide and a height at the center of 8 deet. How high is the arch 6 feet from the center of the base.

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I can not figure out how to solve. I am confused, please help if the ratio of the angles of the triangle is 1:2:3 then what is the ratio of the the sides of the triangle??