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Sagot :
Answer:
103°
Step-by-step explanation:
The angles in a triangle add up to equal 180°.
Answer:103°
solution,
here,
the first angle of triangle = 57°
the second angle of triangle = 20°
let, the third angle of triangle =x
we know that,
sum of angle of triangle=180°
57+20+x=180
77+x=180
x=180-77
therefore, x=103°
therefore, the third angle of triangle is 103°
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