11269606
| Question | Answer |
| Vertically opposite angles are equal (vert opp ∠s) | |
| Adjacent angles on a straight line add to 180° (Adj, ∠s on str. line) | |
| Angles at a point add to 360° (∠s at pt) |
Image:
Anglesat Apoint (image/png)
|
| Angles in a triangle add to 180° (∠ sum of Δ) |
Image:
S6eg1 (image/gif)
|
| The exterior angle of a triangle equals the sum of the two interior opposite angles (ext ∠ of Δ) | |
| The base angles of an isosceles triangle are equal (base ∠s isos. Δ) |
Image:
Isosceles 1 (image/png)
|
| Corresponding angles on parallel lines are equal (corresp ∠s, || lines) | |
| Alternate angles on parallel lines are equal (alt. ∠s, || lines) | |
| Co-interior angles on parallel lines add to 180° (co-int ∠s, // lines) |
Image:
Tp4ch3 Image1 (image/jpeg)
|
| The interior angles of a polygon add to 180(n - 2)°, where n is the number of sides (int ∠ sum of polygon) | |
| The exterior angles of a polygon add to 360° (ext ∠ sum of polygon) |
Image:
Exterior Angles (image/png)
|
| Base isosceles triangle, equal radii (base ∠s isos Δ, = radii) |
Image:
D2g6 (image/png)
|
| The angle at the centre is equal to twice the angle at the circumference on the same arc (∠ at centre) |
Image:
Circle6 (image/jpeg)
|
| Angles on the same arc are equal (∠s on same arc) | |
| The angle in a semicircle is a right angle (∠ in semicircle) |
Image:
Semicircle (image/png)
|
| Opposite angle of a cyclic quadrilateral add to 180° (opp ∠s, cyclic quad) | |
| The exterior angle of a cyclic quadrilateral is equal to the interior opposite angle (ext ∠, cyclic quad) |
Image:
D2g29 (image/png)
|
| The angle where the radius meets the tangent is 90° (tgt ⊥ rad) |
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