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kakasveta [241]
2 years ago
9

Can anyone help with number 9 please

Mathematics
2 answers:
photoshop1234 [79]2 years ago
7 0

Answer:

A) 55

Step-by-step explanation:

angle 3 is an exterior angle. to find the interior angle of the triangle, subtract angle 3 from 180

180 - 110 = 70

all the angles in a triangle add up to 180.

since angles 1 and 2 are the same, you can call them x.

70 + 2x = 180

70 - 70 + 2x = 180 - 70

2x = 180 - 70

2x = 110

2x/2 = 110/2

x = 110/2

x = 55

zlopas [31]2 years ago
3 0

Answer:

A.55

Step-by-step explanation:

The angle that is not numbered =70 because it is the supplementary angles of angle 3. if that is 70 a triangle add to 180 then 180-70=110. and 1 and 2 and equal so 110/2 =55

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