Shijiazhuang Great Wall Welded Pipe Equipment Co. Ltd is located in Shijiazhuang City, Hebei Province, which is a famous base of pipe mill industry in China. We are a high and new technology enterprise specialized in design, development and manufacture of high frequency welded pipe line, ERW pipe mill line, precision pipe mill line, stainless steel pipe mill line, square and rectangular pipe mill line, cold roll forming equipment, slitting line, etc. Shijiazhuang Great Wall is the pioneer that has the key processing and internationally advanced technology of whole-set welded pipe mill. We are qualified ISO 9001:2000 Quality Management System company.
We have been appraised as “Enterprise with Top Credit Standing of 5 stars” as an official example company of China Supplier Business Credit System by CIIC Credit Evaluation Office since 2008 . We also awarded “Annual Trustworthy and Faithful Enterprise” by “Hebei Province Quality Inspection Association” since the year of 2007. Great Wall is the “Honored Trustworthy Membership” by HeBei Quality and Technology Supervision Association.
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More elegant way to find the sum of the exterior angles of a convex polygon
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Geometry on Khan Academy: We are surrounded by space. And that space contains lots of things. And these things have shapes. In geometry we are concerned with the nature of these shapes, how we define them, and what they teach us about the world at large–from math to architecture to biology to astronomy (and everything in between). Learning geometry is about more than just taking your medicine (“It’s good for you!”), it’s at the core of everything that exists–including you. Having said all that, some of the specific topics we’ll cover include angles, intersecting lines, right triangles, perimeter, area, volume, circles, triangles, quadrilaterals, analytic geometry, and geometric constructions. Wow. That’s a lot. To summarize: it’s difficult to imagine any area of math that is more widely used than geometry.
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