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What is skew? Skew lines – Geometry

By |2017-07-29T13:03:09+00:00July 29th, 2017|Math|

These two green lines are skew to each other. Skew is a pretty cool word, and it sounds like it means something really weird, and it kind of does. It means lines that go any which way. It describes any two lines that aren't either parallel or perpendicular to each other, and that don't cross each other anywhere (so [...]

What is a rhombus? Simple geometry

By |2018-04-23T16:01:48+00:00July 29th, 2017|Math|

This is a rhombus, divided so you can figure out the area. A rhombus is a kind of quadrilateral that has two sides that are parallel to each other, and another two sides that are parallel to each other. A rhombus is a special kind of parallelogram, and squares and rectangles are special kinds of rhombus. To figure out the perimeter of the rhombus, you [...]

What is a quadrilateral? Squares and rectangles

By |2017-07-29T12:01:49+00:00July 29th, 2017|Math|

This is a quadrilateral. A quadrilateral is a flat shape, in one plane, defined by four points at the four corners. A quadrilateral has four sides. The sides can be of any length. And it has four corners. They can be at any angle  to each other so long as they add up to 360 degrees. A rectangle is [...]

Perpendicular lines – Simple geometry

By |2017-07-29T11:41:47+00:00July 29th, 2017|Math|

Perpendicular lines Two lines are perpendicular if they cross at right angles. You can test this by extending the lines until they cross (if they do not cross then they are parallel). Where the two lines cross, draw a right triangle, and then see whether the triangle conforms to the Pythagorean Theorem - if so, then your lines are crossing [...]