There is a regular pentagon. The length of its side is a. Find the area of the pentagon. Generalize your result for a nonagon.

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A merchant bought 50,000 pounds of pepper in Portugal for 10,000 scudi and paid a tax of 500 scudi.

A biography stressing Agnesi's deep commitment to help those in need.

There is a mound of earth in the shape of a frustum of a cone.

Given two circle tangent at the point P with parallel diameters AB, CD, prove that APD and BPC are straight lines.

The ICM meets every four years. This year, the meeting takes place August 22-30 and is being held in Madrid. Section 20 of the Congress deals with the history of mathematics.

An excellent and careful study of matrix methods for solving systems of linear equations in first century China.

Make a crown of gold copper, tin, and iron weighing 60 minae: gold and copper shall be 2/3 of it; gold and tin, 3/4 of it; and gold and iron, 3/5 of it. Find the required weights of gold, copper, tin, and iron.

On a certain ground stands two poles 12 feet apart, the lesser pole is 35 ft. in height and the greater 40 ft. It is sought, if the greater pole will lean on the lesser, then in what part will it touch?

Title page from the Ars Magna, by Gerolamo Cardano, published in 1545. Engraved portrait of the author. First printed text of algebraic solution of cubic equations.