Section 8.3 Properties of Angles in Circlesmath.mvhs.nbed.nb.ca/K. Sears/documents/8... · 8_3...
Transcript of Section 8.3 Properties of Angles in Circlesmath.mvhs.nbed.nb.ca/K. Sears/documents/8... · 8_3...
-
8_3 Properties_of_Angles_in_a_Circle.notebook April 29, 2015Warm Up
April 29, 2015
O82o mo
Determine the value of m, when O is the centre
Determine the value of x, when O is the centre
O
x
815
14 cm
5 cm
x
Find x
Section 8.3
Properties of Angles in Circles
-
8_3 Properties_of_Angles_in_a_Circle.notebook April 29, 2015
• The longer arc AB is the major arc .
• The shorter arc AB is the minor arc.
A B
Central Angle: The angle formed by joinging the endpoints of a arc to the centre of a circle (involves radii)
Inscribed Angle: The angle formed by joinging the endpoints of a arc to a point on the circle
A B
o
Central Angle
A B
o
CInscribed Angle
Inscribed and central angles are SUBTENDED by the MINOR arc
come from the same 'smaller arc'{
-
8_3 Properties_of_Angles_in_a_Circle.notebook April 29, 2015
O
Q
P
R
In a circle, the measure of a central angle subtended by an arc is TWICE the measure of an inscribe angle subtended by the same arc.
-
8_3 Properties_of_Angles_in_a_Circle.notebook April 29, 2015
All inscribed angles subtended by a semicircle are right angles B
A
H
F
G
Makes sense Inscribed angles are always half the centre
Center Angle = 180o (Straight Line)
Inscribed angle is half the Central Angle
Inscribed = (1/2) central =(1/2) 180o
= 90o
180o
Point O is the center of a circle. Determine the values of ko and to.
O
BG
R
W
to ko
24o
-
8_3 Properties_of_Angles_in_a_Circle.notebook April 29, 2015
O32o
yo
xo
A
B
C
In Triangle ABC,
-
8_3 Properties_of_Angles_in_a_Circle.notebook April 29, 2015
Homework:
p.410 4123456911
#
-
Attachments
CSI Crime Scene Investigation.mp3
36648.0
SMART Notebook
Page 1Page 2Page 3Page 4Page 5Page 6Attachments Page 1