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Cercul

Elemente de teorie

TermDefinition
Raza Distanta de la centrul cercului la un punct al acestuia
Coarda Segmentul determinat de doua puncte ale unui cerc
Arc Portiunea de cerc determinata de doua puncte ale acestuia
Diametru Coarda care trece prin centrul cercului
Unghi la centru Unghi cu varful in centrul cercului
Tangenta Dreapta care are un singur punct comun cu cercul
Secanta Dreapta care are exact doua puncte comune cu cercul
Punct interior cercului Distanta de la centrul cercului la acest punct, este mai mica decat raza
Punct exterior cercului Distanta de la centrul cercului la acest punct, este mai mare decat raza
Cecuri exterioare Nu au puncte comune si distanta dintre centrele lor este mai mare decat suma razelor lor.
Cercuri tangente exterioare Au un singur punct comun si distanta dintre centrele lor este egala cu suma razelor lor.
Cercuri secante Au exact doua puncte comune
Cecuri tangente interioare Au un singur punct comun si distanta dintre centrele lor este egala cu diferenta in modul, a razelor lor.
Cercuri interioare Nu au puncte comune si distanta dintre centrele lor este mai mica decat diferenta in modul, a razelor lor.
Unghi inscris in cerc Unghiul cu varful pe cerc, ale carui laturi sunt secante ale cercului
Masura unui arc mic de cerc Masura unghiului la centru corespunzator
Lungimea cercului 2πR
Aria discului πR²
Masura cercului 360°
Cercuri concentrice Cercuri care au acelasi centru
Cercuri congruente Cercuri care au razele egale
Created by: edumary
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