Eratosthenes was one of the most famous mathematicians in the early times. He was famous for his sieve – a strategy for finding prime numbers – but one of his greatest achievements was estimating the circumference of the earth. In this post, we learn how Eratosthenes used mathematics to solve the size of the earth. […]

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# Elementary School Geometry

## Is a square a rectangle?

Note: This article is written for an elementary school students’ point of view. _____ I have noticed that the topics I am discussing is getting deeper and harder, so let me break the spell by this very elementary question: Are squares rectangles? Before we answer that question, we must know first what a rectangle looks […]

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## Area Tutorial 5 – Area of a Trapezoid

In this tutorial, we are going to derive the area of a trapezoid. A trapezoid (sometimes called a trapezium) is a quadrilateral with exactly one pair of parallel sides. Trapezoid PQRS is shown below, with PQ parallel to RS. We have learned that the area of the trapezoid with bases and and altitude is given […]

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