day 21 - amazon s3 · construct: angle bisector next year mark this up a little better Ñ angle...
TRANSCRIPT
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1. Opener a) Make a triangle ADB.
b) Construct the bisector the obtuse angle you were given.
c) What is the measure of x in the figure below?
d) What are the next two terms: 6, 10, 1, 5, 9, 13, 4, 8, 12, ... ,
e) What three-word phrase appeared on the front of the first official US coin, minted in 1787?
Day 21
x°
60°
107°
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mind your business
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2. Notes - Points of Concurrency
Make a checklist:
Incenter
Circumcenter
Orthocenter
Centroid
(angle bisectors)
(perpendicular bisectors)
(altitudes)
(medians)
Point of concurrency: The place where three or more lines meet.
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2. Notes - Points of Concurrency
Incenter (angle bisectors)
Construct: Angle Bisector
next year mark this up a little better — angle markings, constructions markings, something. everyone says “they all look the same.”
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2. Notes - Points of Concurrency
Circumcenter (perpendicular bisectors)
Construct: Perpendicular Bisector
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2. Notes - Points of Concurrency
Orthocenter (altitudes)
Construct: Drop a perpendicular.
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2. Notes - Points of Concurrency
Centroid (median)
Construct: Perpendicular Bisectors
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3. Triangle Worksheet
4. Concept Quiz
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1. Opener a) What is the 37th term: 9, 16, 23, 30, ... ,
b) After how many terms will the sequence above pass 3000?
c) Draw a triangle. Any triangle.
d) Use the triangle from (c) and a compass. Construct the largest circle possible inside the triangle. It should touch, but not cross, all three sides.
e) Construct a circle that touches all three vertices of the triangle from (c).
f) Find d in the figure below.
g) How much does the most expensive coffee in the world cost per pound?
Day 22
42°
57°
110°
d
130°
24°
8
$120 and $600 per pound, $50 per cup at one Australian coffee shop, kopi luwak, made from the droppings of the civet
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9
$8500
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$8500
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2. Notes - Points of Concurrency
Orthocenter (altitudes)
Construct: Drop a perpendicular.
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2. Notes - Points of Concurrency
Centroid (median)
Construct: Perpendicular Bisectors
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2. Notes - Fun Facts About The Centroid! 1. The centroid is the center of gravity of a triangle.
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2. Notes - Inscribed & Circumscribed Circles
Fact: for every triangle there is a largest circle that will fit inside.
Fact: for every triangle there is a smallest circle that will fit around the outside.
the inscribed circle
the circumscribed circle
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2. Notes - Constructing the Circumscribed Circle
Construct the circumcenter (perpendicular bisectors)
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2. Notes - Constructing the Inscribed Circle
Construct the incenter (angle bisectors)
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3. Classwork
pages 5 & 6 of your Li’l Book of Constructions
4. Break
5. Show and Tell
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5. Five for the Weekend Recomendaciones, por favor.
1 “Teenage Queen,” Aiden Chloe G
2 “Coolin,” Abstract Rude Robert K
3 “Prayer of the Refugee,” Rise Again Trent C
4 “Internally Bleeding,” Immortal Technique D Churchill
5 “Not Good Enough for Truth in Cliché,” Escape the Fate April A
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-1
1
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5. Five for the Weekend Recomendaciones, por favor.
1 “Crown,” Mason Jennings Brodey S
2 “Beer,” PsychoStick Tad T
3 “Comfort Eagle,” Cake Nick G
4 “The Gift,” Angels & Airwaves Heather F
5 “Situations,” Escape the Fate Roni C
+1
-1
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1
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1. Opener a) Draw an obtuse triangle.
b) Construct its circumscribed circle.
c) 5°: Construct its inscribed circle.
c) 6°: Construct its centroid.
d) Construct a 45° angle.
e) What is the 2007th term: 1, 5, 4, 12, 7, 19, 10, 26, 13, ... ,
f) What percent of Americans believe they’re above-average drivers? What percent believe they’re below-average?
Day 23
22
74% ... 1%
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2. Notes - Inscribed & Circumscribed Circles
Fact: for every triangle there is a largest circle that will fit inside.
the inscribed circle
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2. Notes - Constructing the Inscribed Circle
Construct the incenter (angle bisectors)
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2. Notes - Parallel Line Construction
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How many lines can you draw through P that are parallel to AB? How do we construct it? Anybody get any ideas?
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2. Notes - Make A Rhombus
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How many lines can you draw through P that are parallel to AB?
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2. Notes - Make A Rhombus
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How many lines can you draw through P that are parallel to AB?
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2. Notes - Make A Rhombus
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How many lines can you draw through P that are parallel to AB?
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3. Classwork pg. 162 // #3 - 5, 11 (yes, you have to draw the picture) pg. 151 // #15 - 20 Visual Thinking Skills // #1-3
4. Break
5. Show and Tell
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6. Concept Quiz
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How many parts of a triangle are there? How many do I need to give you to guarantee you have a triangle? It depends.