← Ai Tong School · Paper 2

Question 9a

Video explanation ↓

In the figure, DA = DB = DC. ∠ADC = 138°, ∠BCE = 22° and ∠BAC = 47°.BED and AEC are straight lines.Find ∠DCA. (1 mark)

$Question 9a diagram$

Answer: 21 °

Workings

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since DA = DC, that makes DAC an isosceles triangle

∠ DCA → (180 - 138) ÷ 2 = 21°

Video explanations

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