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millerbe1228
29.06.2019 •
Mathematics
True or false? a circle could be circumscribed about the quadrilateral below.
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Ответ:
The correct answer is: False
Step-by-step explanation:
If the sum of the opposite angles in a quadrilateral is 180°, then a circle can be circumscribed about the quadrilateral.
Here,![\angle B+\angle D= 110\°+90\° = 180\°](/tpl/images/0030/0928/817e5.png)
but,![\angle A+\angle C= 70\°+90\°= 160\°](/tpl/images/0030/0928/bb5e9.png)
So, a circle can't be circumscribed about the given quadrilateral.
Ответ:
3x = 2x + 6 + 6
3x = 2x + 12
3x - 2x = 12
x = 12