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Tyrant4life
18.07.2019 •
Mathematics
Acircle centered at 0,0 includes point a (0,8). point b lies on the circle such that the center angle with endpoints a and b measures 1 radian. what is the length of ab a. 8 b. 4pi c. 16 d. 8pi
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Ответ:
the equation of a circle is
(x-h)²+(y-k)²=r²
where
(h,k) is the center
and r is the radius
in this problem (h,k) is (0,0)
so the equation is
x²+y²=r²
step 1
find the radius
substitute the point a (0,8) in the equation
0²+8²=r²> r=8
step 2
find the circumference
C=2*pi*r> C=2*pi*8> C=16*pi units
if 2*pi radians (full circle) has a length of> 16*pi
1 radians> x
x=16*pi/(2*pi)> 8 units
the answer is the option
A) 8
Ответ:
(in the image)
Step-by-step explanation:
for the slope one - both triangle a and b have a slope of 5/3 (b's goes from 15/9 to 5/3 because of simplifying)
for the second one - 5/3=15/9 because the sides of both triangles correspond