# Convergence articles

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A report on an Australian teacher's use of material from the Rhind Papyrus.
Prove that if the sums of the square opposite sides of any quadrilateral are equal, its diagonals interect at right angles.
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?
This 1989 revision of the 1969 NCTM yearbook still provides wonderful suggestions for using the history of mathematics in the classroom.
Page 10: Courant through D'Ambrosio
Page 11: Dantzig to Dieudonne
There are a number of wonderful mathematics websites that readers of Convergence should be aware of. We describe some of them here.
This is a page from an early printed edition of the Arithmetica of Jordanus de Nemore (early 13th century).
A man bought a number of sheep for $225; 10 of them having died, he sold 4/5 of the remainder for the same cost and received$150 for them. How many did he buy?
Two travelers, starting at the same time from the same point, travel in opposite directions round a circular railway.