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02.11.2020 •
Mathematics
If the diameter of a large trampoline is 26 ft., then the radius must be
A. 81.64ft
B. 52ft
C. 40.82ft
D. 13ft
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Ответ:
Explanation:
The radius of a circle is half of the diameter.
Ответ:
Step-by-step explanation:
We know that all the vertices of the isosceles trapezoid lie on the parabola, and the points A and D lie along the x-axis, i.e at![y=0](/tpl/images/0450/2009/08c08.png)
Therefore points A and D are located where
Now we need to find the coordinates of point C; we already have its y-coordinate (it's
), and looking at the figure attached we see that the x-coordinate of point C is
farthar from the coordinate of point C; thus
Therefore the coordinates of C are![C=(0.1547,2)](/tpl/images/0450/2009/16cb6.png)
Now this point C lies on the parabola, and therefore must satisfy the equation![y=a(x+1)(x-5):](/tpl/images/0450/2009/7ce28.png)