This section deals with 2D shapes and angles related to them. It might be worth looking at the National 4 Angles section before continuing. For any triangle, the three angles add up to \(180^\circ\).
The angle at the circumference in a semicircle is 90°. Angle STU = 90° Angles in a triangle add up to 180°. The angle on a straight line is 180°. The angle VOY = 180°. The angle at the centre is ...
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