Given the same circle as ''Geometry time!'' below you are now requested to to find the length of the section OAB(L). However the radius of the circle must be found in a different way: You have to find first the average of the small base (b) and the big base(B) of the trapezoid also given below.
Further explanation: 1)Theta angle(Θ) together with the area of the trapezoid(A_tp) will be given.
2) You also are given that the height(H) of the trapezoid is the same as the third triangular number(https://en.wikipedia.org/wiki/Triangular_number)
3) Theta will be in degrees this time!
Tip: L = perimeter.
GOOD LUCK!!!!!!!!!!!!!!!!!!!!!!!
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Last Solution submitted on Aug 24, 2026

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Christian Schröder

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