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Basics of Geometry
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II Lines Polygons
Triangles
Area and Perimeter
3D Shapes
S. A. and Vol.
Similar Shapes
Circles
Trigonometry
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ICS
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9.1
Example 1 answers:
The radius can be:
GD, ED, CD, or DF
.
The Diameter is
CE
.
The chord is
AB
.
The arc is
EF
and it is a minor arc (less than 180°)
(back)
9.2
Example 2 answers:
(AE)²+7²=9²
(AE)²=9²7²
(AE)²= 32
(square root of 32)
AE= 5.66
By the Radius and Chord theorem, AB bisects CD, so DE= CE=4. Therefore, CD=BE+DE= 5.66+5.66= 11.31(CD)
(back)
9.3
Example 3 answers:
78°/2=39°
(back)
9.4
Example 4 answers:
120°/2=60°
89°/2=44.5°
(back)
9.5
Example 5 answers:
12
12
(back)
9.6
Example 6 answers:
(x4)²+(y+7)=36 4 and +7 are the opposites of the center of the circle.
36 is the radius squared.
x²+y²=25
To get the intercepts you use the radius (5). The center is 5 away from the intercept.
(Created by Shelby)
(back)
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9.1
Example 1 answers:
(back)
9.2
Example 2 answers:
(AE)²+7²=9²(AE)²=9²7²
(AE)²= 32
(square root of 32)
AE= 5.66
By the Radius and Chord theorem, AB bisects CD, so DE= CE=4. Therefore, CD=BE+DE= 5.66+5.66= 11.31(CD)
(back)
9.3
Example 3 answers:
78°/2=39°(back)
9.4
Example 4 answers:
(back)
9.5
Example 5 answers:
(back)
9.6
Example 6 answers:
 (x4)²+(y+7)=36 4 and +7 are the opposites of the center of the circle.
 x²+y²=25
To get the intercepts you use the radius (5). The center is 5 away from the intercept.36 is the radius squared.
(Created by Shelby)
(back)