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3 years ago

Please help!? Work out the size of angle x. 42 degrees and 123 degrees?

Mathematics

2 answers:

vlabodo [156]3 years ago

5 0

Answer:

Sorry I don´t know the answer but I tried

Step-by-step explanation:

netineya [11]3 years ago

4 0

Answer:

x° = 99°

Step-by-step explanation:

Sum of angles on a straight line is 180°.

180° - 123° = 57° (sum of angles on a straight line)

Sum of angles in a triangle is 180°. Let u be the value of the unknown angle in the triangle.

57° + 42° + u° = 180°

u° = 180° - 57° - 42°

u° = 81°

Sum of angles on a straight line is 180°.

x° + 81° = 180°

x° = 180° - 81°

x° = 99°

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