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SingaporeMathsQuick questions

Geometry and Properties of Circles

Quick questions on Angles, triangles and polygons explained: O-Level E-Maths

6short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What are parallel-line angles?
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When a straight line (transversal) crosses two parallel lines:
What is angles in a triangle?
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The interior angles of a triangle add to 180∘180^\circ. An exterior angle of a triangle equals the sum of the two opposite interior angles. Special triangles help too: an isosceles triangle has two equal base angles, and an equilateral triangle has three 60∘60^\circ angles.
What is angles in a polygon?
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$interior angle sum=(n−2)×180∘\text{interior angle sum} = (n - 2) \times 180^\circ$
What is q1?
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Find the interior angle sum of a hexagon. [1 mark]
What is q2?
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Two angles on a straight line are xx and 2x+30∘2x + 30^\circ. Find xx. [2 marks]
What is q3?
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Each exterior angle of a regular polygon is 24∘24^\circ. Find the number of sides. [2 marks]

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