This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
This work includes material that may be protected as a trademark in some jurisdictions. If you want to use it, you have to ensure that you have the legal right to do so and that you do not infringe any trademark rights. See our general disclaimer. This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required.See Commons:Licensing.
Uploaded a work by BSTI from http://www.bsti.gov.bd/site/page/4337afbd-0883-48e8-8142-34c83231f4b9/%27b%27-%E0%A6%B2%E0%A7%8B%E0%A6%97%E0%A7%8B-%28%E0%A6%AE%E0%A6%BE%E0%A6%B0%E0%A7%8D%E0%A6%95%29 with UploadWizard