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Централен агол
Воведна задача за централен агол.
Воведување на поимот централен агол, соодветна тетива, соодветен кружен лак.
Колку е радиусот на кружницата?
Кој е централен агол?
Која е негова соодветна тетива?
Кој е цоодветниот кружен лак?