Question

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Answer 1

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[1.] Sum of all angles = 360°

80° + 45° + 105° + 2x-5 = 360°

125° + 105° + 2x-5° = 360°

230° + 2x-5° = 360°

2x+5° = 360-230

2x-5° = 130°

2x = 130+5

2x = 135

x = 135/2

x = 67.5

Now put the value of x in the equation;

= 2x - 5

= (2×67.5)-5

= 135-5

= 130° [Answer]

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[2.] Sum of all angles = 360°

60° + 110° + 120° + x = 360°

170° + 120° + x = 360°

290° + x = 360°

x = 360 - 290

x = 70 [Answer]

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