bellringer 67° x°x° y°y° x = ? y = ? this is a base angle of an isosceles triangle. it must...
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![Page 1: BELLRINGER 67° x°x° y°y° x = ? y = ? This is a base angle of an isosceles triangle. It must measure 67° 67 Find x by using LP. 67 + x = 180. -67 -67 x](https://reader036.vdocument.in/reader036/viewer/2022081806/56649edb5503460f94bead13/html5/thumbnails/1.jpg)
BELLRINGER
67°
x°
y°x = ?
y = ?
This is a base angle of an isosceles triangle. It must measure 67°
67
Find x by using LP. 67 + x = 180.
-67 -67
x = 113°
Lastly, use TAS to find y. 67 + 90 + y = 180
y = 23°
![Page 2: BELLRINGER 67° x°x° y°y° x = ? y = ? This is a base angle of an isosceles triangle. It must measure 67° 67 Find x by using LP. 67 + x = 180. -67 -67 x](https://reader036.vdocument.in/reader036/viewer/2022081806/56649edb5503460f94bead13/html5/thumbnails/2.jpg)
What is the maximum number of congruent angles in a Scalene Triangle? In an equilateral triangle, we already
showed that all 3 angles are congruent. (60, 60, 60).
In an isosceles triangle we showed that TWO angles are congruent, the base angles.
Thus, there can be NO angles congruent in a scalene triangle, otherwise it would be isosceles or equilateral.
![Page 3: BELLRINGER 67° x°x° y°y° x = ? y = ? This is a base angle of an isosceles triangle. It must measure 67° 67 Find x by using LP. 67 + x = 180. -67 -67 x](https://reader036.vdocument.in/reader036/viewer/2022081806/56649edb5503460f94bead13/html5/thumbnails/3.jpg)
Triangle Angle-Side Relationships
You will find that the largest angle in a triangle corresponds to the longest side, and the smallest angle corresponds to the shortest side.
For example, name the sides from shortest to longest!
80
43
57
p
q
r68
52
60
xy
z
q, p, r z, x, y
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In Other Words,
LARGEST
LONGEST
SMALLEST
SHORTEST
![Page 5: BELLRINGER 67° x°x° y°y° x = ? y = ? This is a base angle of an isosceles triangle. It must measure 67° 67 Find x by using LP. 67 + x = 180. -67 -67 x](https://reader036.vdocument.in/reader036/viewer/2022081806/56649edb5503460f94bead13/html5/thumbnails/5.jpg)
What is a median?
The median of a triangle connects a vertex to the opposite side’s midpoint.
X
Y
Z The three medians of any triangle are concurrent at the CENTROID.
![Page 6: BELLRINGER 67° x°x° y°y° x = ? y = ? This is a base angle of an isosceles triangle. It must measure 67° 67 Find x by using LP. 67 + x = 180. -67 -67 x](https://reader036.vdocument.in/reader036/viewer/2022081806/56649edb5503460f94bead13/html5/thumbnails/6.jpg)
Special segments of a triangle Can you find the altitude, angle
bisector, median, perpendicular bisector, and midsegment??
Altitude
Angle Bisector
Median
Perpendicular Bisector
Midsegment
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Summarize our findings . . .
The angle bisectors of a triangle are concurrent at the incenter. The circle centered at the incenter is inscribed in the triangle.
The perpendicular bisectors of a triangle are concurrent at the circumcenter. The circle centered at the circumcenter circumscribes the triangle.
The altitudes of a triangle are concurrent at the orthocenter. (We will investigate the orthocenter after break).
The medians of a triangle are concurrent at the centroid. The centroid is the center of mass of the triangle.
![Page 8: BELLRINGER 67° x°x° y°y° x = ? y = ? This is a base angle of an isosceles triangle. It must measure 67° 67 Find x by using LP. 67 + x = 180. -67 -67 x](https://reader036.vdocument.in/reader036/viewer/2022081806/56649edb5503460f94bead13/html5/thumbnails/8.jpg)
Picture it all together . . .
A
DC
B
A = altitudes
B = angle bisectors
C = medians
D = perpendicular bisectors
![Page 9: BELLRINGER 67° x°x° y°y° x = ? y = ? This is a base angle of an isosceles triangle. It must measure 67° 67 Find x by using LP. 67 + x = 180. -67 -67 x](https://reader036.vdocument.in/reader036/viewer/2022081806/56649edb5503460f94bead13/html5/thumbnails/9.jpg)
Hiding the lines . . .
A
DC
B
A = altitudesB = angle bisectorsC = mediansD = perpendicular bisectors