distance
from
center
,
a
1
.
815
P
equation
of
upper
tangent
line
:
x
+
1
.
515
y
=
1
.
815
central
angle
=
1
.
97455
radians
area
of
red
segment
=
0
.
527482
sq
.
units
area
of
blue
curvilinear
triangle
=
0
.
527393
sq
.
units
blue
area
/
red
area
=
0
.
999832
0
.
0
0
.
5
1
.
0
1
.
5
2
.
0
2
.
5
3
.
0
0
.
0
0
.
5
1
.
0
1
.
5
2
.
0
2
.
5
3
.
0
central
angle
(
radians
)
area
in
square
units
the
two
areas
and
their
ratio
(
black
line
)