A rifle ball is fired through a three-inch plank, the resistance of which causes an unknown constant retardation of its velocity.

Individual problems from throughout mathematics history, as well as articles that include problem sets for students.

There is a garden is the shape of a rhombus whose side is 768.52 feet. Within the garden is an inscribed square flower bed whose side is 396 feet. What is the area of the garden?

As for a square piece of land that amounts to 100 square cubits, if it is said to you, "Cause it to make a piece of land that amounts to 100 square cubits that is round," what is the required diameter?

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

The purchase price for an apple and an orange is 100 yen. When n oranges and n + 3 apples are bought the price is 520 yen. Find the number n of oranges and the price of one orange.

Two men rent a pasture for 100 liras on the understanding that two cows are to be counted as being equivalent to three sheep. The first puts in 60 cows and 85 sheep; the second 80 cows and 100 sheep. How much should each pay?

Having been given the perimeter and perpendicular of a right angled triangle, it is required to find the triangle.

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?

Determine the dimensions of the least isosceles triangle ACD that can circumscribe a given circle.

A certain man had in his trade four weights with which he could weigh integral pounds from one up to 40. How many pounds was each weight?