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Convergence articles

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The work of ten scientists who thought deeply about patterns.
What is the perpendicular height of a cloud when it's angles of elevation were 35 degrees and 64 degrees as taken by two observers?
A portrait gallery of mathematicians, mostly taken from the collection at the Dibner Library of the Smithsonian, with permission.
Determine the radii of three equal circles decribed within and tangent to a given circle, and also tangent to each other
Whimsical posters of fifteen mathematicians with brief biographies.
Guidelines for Submissions
This is a page from an early printed edition of the Arithmetica of Jordanus de Nemore (early 13th century).
Find two numbers, x and y, such that their sum is 10 and x/y + y/x = 25
Wanting to know the breadth of a river, I measured a base of 500 yards in a straight line close by one side of it.