Transcript Triangles and Angles - Frederick Douglass Academy High

Geometry OTQ
Are you ready for this chapter?
pg. 235
1 – 3, 5, and 6
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Homework Questions?
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What will I be able to do?
Identify and classify triangles by angles and sides
What standard will I learn?
12.0 Students find/use measures of sides/angles
of triangles
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4.1 Triangles and Angles
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Classifying Δs
(angles vs sides)
Equiangular
(all  s)
Acute
(3 acute s)
Equilateral
(3  sides)
40
80
60
Right
(1 right )
Obtuse
(1 obtuse )
Isosceles
(2  sides)
Scalene
(0  sides)
120
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What kind of triangle does the cablesuspension of this bridge have?
RIGHT TRIANGLE!!!!
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Example 1:
Classify each triangle by its
angles and sides.
1.
MNQ
acute; equilateral
2.
NQP
obtuse; scalene
3.
MNP
acute; scalene
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Example 2:
Classify the triangle by the description given:
A) Side lengths: 3 in, 5 in, 3 in
Isosceles
B) Side lengths: 3 ft, 5 ft, 4 ft
Scalene
C) Angle measures: 60°, 90°, 30°
right
D) Angles measures: 10°, 160°, 10°
obtuse
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Pencils Down!
Complete the sentence with always, sometimes, or never.
1) A scalene
2) A right
never
is ________
an equilateral
.
always
________
has an angle of 90°.
sometimes
3) An isosceles triangle is __________ an
equilateral
.
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SUMMARY
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CLASSWORK
Pages 241 – 242 #’s 22 – 36 even,
40 – 46 even
Homework is on the next slide
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HOMEWORK
Page 244 #’s 74 – 80 even
Do your homework….or Pyramid
Head will be sent to your house!!!
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