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donbright100
25.10.2021 •
Mathematics
Find the value of x in each case. 18 c
please hurry
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Ответ:
check the picture below.
recall that angles that lie on a flat-line, namely linear angles, sum up to 180°, so the two siblings lying on that red line, is 5x and 180 - 5x.
180 - 5x, being the exterior angle at the vertex C, stemming from AC.
so, we have three exterior angles, since it's a triangle, 8x, 9x and (180 - 5x), let's bear in mind that the sum of all exterior angles is 360°.
If you check both images you can see that the answer is x = 15
Ответ: