| Pregunta | Respuesta |
| isos. △ if 2 sides = radii | |
| a = b | base <'s isos. △ = radii |
| < at centre | |
| a = 90° | < in semi-circle = 90° |
| a = 80° | <'s on same arc = |
| a + c = 180° b + d = 180° | opp. <'s cyclic quad. = 180° |
| d = b | ext. <, cyclic quad. |
| a = 90° | tgt. ⊥ radius = 90° |
| tgt. lines from pt. = | |
| ⊥ from centre bisects chord | |
| e = d | < in alt. segment = |
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