thursday , january 5 th
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Thursday , January 5 th. Warm Up. Write 1% as a fraction What is 5% of 20. Please complete the warm up and write down your homework Please have your flashcards out and I will give you a ziploc bag . Corny Joke of the Day. Why did Columbus go to jail? - PowerPoint PPT PresentationTRANSCRIPT
Thursday, January 5th • Please complete the warm up and write
down your homework• Please have your flashcards out and I will
give you a ziploc bag
Warm Up1. Write 1% as a fraction2. What is 5% of 20
Corny Joke of the Day
Why did Columbus go to jail?
Because he double-crossed the ocean
Goal Sheets Put in front of binder
Similar Figures
Chapter 7 section 4
VocabularyPolygoncorresponding sidescorresponding anglesSimilarCongruent
PolygonA closed plane figure formed by three or more line segments that intersect only at their endpoints
Can you think of any?
Polygons Not
CongruentHave the same size
and shape
EXACTALY THE
SAME!!!!!
Do you have any
CONGRUENT shapes?
Matching sides of two or more polygons are called corresponding sidesMatching angles are called corresponding angles.
Similar FiguresTwo figures are similar if• the measures of the corresponding angles are equal• the ratios of the lengths of the corresponding sides are proportional
Similar figures have the same shape but not necessarily the same size.
Finding missing angles
Hint: Remember angles are the same in corresponding angles!
What is angle D? <D
Finding Missing lengths
111 y
___ 100 200
____ = Write a proportion using corresponding side lengths.
The cross products are equal.200 • 111 = 100 • y
The two triangles are similar. Find the missing length y
y is multiplied by 100.22,200 = 100y
22,200 100
______ 100y 100
____ = Divide both sides by 100 to undo the multiplication.
222 mm = y
YOU TRY!
52 y
___ 50 100
____ = Write a proportion using corresponding side lengths.
The cross products are equal.100 • 52 = 50 • y
A B60 m 120 m
50 m 100 my
52 m
65°
45°
The two triangles are similar. Find the missing length y and the measure of B.
y is multiplied by 50.5,200 = 50y
5,200 50
_____ 50y 50
___ = Divide both sides by 50 to undo the multiplication.
104 m = y
Angle B is a corresponding angle to <A<B = 65°
Are the following shapes SIMILAR?
5 in
2 in
2 in1 in
How do you know?
Closing ActivityAnswer the EQ on the bottom of the page.Raise your hand when you are done and I will check your answer
Help others in your group and then begin your homework