Sa gheoiméadracht, an fhíor a dhéanann dhá líne dhíreacha a thagann le chéile ag pointe. Tomhaistear uillinneacha i rothluithe (go príomha in aghaidh an nóiméid nó an tsoicind nuair a bhíonn an luas uilleach i gceist), dronuillinneacha, céimeanna (°), raidiain (rad), nó graid. 1 rothlú = 4 dhronuillinn = 360° = 2 π rad = 400 grad.[1]
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