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Convergence articles

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A circle, a square and an equilateral triangle all have the same perimeter equal to 1 meter. Compare their areas.
A horse halving its speed every day runs 700 miles in 7 days.
The number 50 is divided by a certain number. If the divisor is increased by 3, the quotient decreases by 3.75. What is the number?
How high above the earth must a person be raised that he [or she] may see 1/3 of its surface?
An image of the calendar, together with instructions for its use
Prove that the area of a regular polygon can be given by the product of its perimeter and half the radius of the inscribed circle.
This is the title page to the 1811 edition of the Descriptive Geometry of Gaspard Monge (1746-1818). This book deals with methods for representing three-dimensional objects in two dimensions. It was written to accompany Monge's courses at the Ecole Polytechnique in Paris.
A thorough study of Benjamin Franklin's mathematical accomplishments, in particular his work on magic squares.
Now there are six-headed four legged animals and four-headed two-legged birds. Find the total number of animals and birds.
Rabbits and pheasants are put in a basket.