Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
등고는 두 도형의 크기와 모양이 동일할 때 성립한다.Deunggoneun du dohyung-ui keugiwa moyangi dongilhal ttae seongnip-handa.Isometry occurs when two figures have the same size and shape.