Properties of Geometrical Figures, SM-Bank 013

In the right-angled triangle below, determine the value of \(x^{\circ}\). (2 marks)

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\(57^{\circ}\)

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\(\text{Right-angle}\ = 90^{\circ}\)

\(x^{\circ}\)	\(=180-(90+72)\ \ \text{(180° in triangle)} \)
	\(=18^{\circ}\)