YouTube on MSNOpinion

Learn how to determine the measure of a semi circle

Learn how to solve problems with arcs of a circle. An arc is a curve made by two points on the circumference of a circle. The ...
YouTube on MSNOpinion

Given two congruent chords, determine the measure of x for an arc

Learn how to solve problems with arcs of a circle. An arc is a curve made by two points on the circumference of a circle. The ...
Gizmodo

Measuring the circumference of the world

Do you know how to measure the diameter of the earth? No? Then you’re less advanced than they were in 230 BC. You’re basically a Neanderthal with access to a microwave. Find out how to fix that in ...
Greek Reporter

Measuring the Earth: Greek Students Recreate Eratosthenes’ Historic Experiment

Students in Greece will revive Eratosthenes' calculation of the Earth’s radius and circumference, a remarkable experiment in ...