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Find the value of \(a^{\circ}\) in the diagram below. (2 marks)
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\(\angle BCD\ \text{(reflex)} = 360-130=230^{\circ}\)
\(\text{Since there are 360° in a quadrilateral:}\)
| \(360\) | \(=a+40+230+30\) | |
| \(360\) | \(=a+300\) | |
| \(a^{\circ}\) | \(=360-300\) | |
| \(=60^{\circ}\) |
A six sided figure is drawn below.
What is the sum of the six interior angles? (2 marks)
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Choon drew a shape. It had one pair of parallel sides and two internal reflex angles.
Which of these could be Choon's shape?
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| A | B | C | D |
\(\text{Internal reflex angles are greater than 180°.}\)
\(\Rightarrow D\)