tuesday, february 7th
DESCRIPTION
Tuesday, February 7th. Warm-Up. Please complete warm-up Take out homework (WB 10-1). Find the Area each figure 1.2. 15 cm. 7.6 mm. 3.5 cm. Corny Joke of the Day a tribute to Tanner to week. What is invisible and smells like Bananas? “A monkeys burb”. Measurement Retest. - PowerPoint PPT PresentationTRANSCRIPT
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Tuesday, February 7th• Please complete warm-up• Take out homework (WB 10-
1)Warm-Up
Find the Area each figure 1. 2.
15 cm
7.6 mm3.5 cm
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Corny Joke of the Daya tribute to Tanner to week
What is invisible and smells like Bananas?
“A monkeys burb”
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Measurement Retest
Reteach: WEDNESDAY
Retest: FRIDAY
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Homework Answers
Can you find my mistakes?
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Ms. Evan’s Answers
1.About 16 ft²2.About 49 m²3.63 yd²4.96 mi²
5.10.5 in²6.488 ft²7.100 ft²8.26 in²9.260 ft²
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Which Area formula matches the shape?
2. a=lw1. a=s² 2. a=bh
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Flashcard Make one flashcards:
1.Area of a Parallelogram
a=bhA=Base x Height
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Base
Height
Describe how finding the area of the parallelogram is like finding
the area of a rectangle.
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Why does this work?
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Triangle Investigation
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Complete the Table and DISCOVER the rule
Triangle
Base Height Area
1. 360 in²
2. 18 cm²
3. 21 m²
4.5 cm
8 cm
14 m
3 m
#1 #2 #3
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You can divide any parallelogram into two congruent triangles.
So the area of each triangle is half the area of the parallelogram.
Base
HeightHeight
Base
Why Does This Work?
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AREA OF A TRIANGLE
b
A = 12
bhThe area A of a triangleis half the product of itsbase b and its height h.
h
FORMULA
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Helpful Hints
1. Formula can be written as:
2. The base and the height must form right angles!
2
bhA
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Find the area of the triangle.
A = 12
bh Write the formula.
A = 12
(20 · 12) Substitute 20 for b and 12 for h.
A = 120
The area is 120 ft2.
A = 12
(240) Multiply.
Stop, Drop, and Watch
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Find the area of the triangle.
A = 12
bh Write the formula.
A = 12
(30 · 24) Substitute 30 for b and 24 for h.
A = 360
The area is 360 in2.
A = 12
(720) Multiply.
#1 Let’s Try Together!
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Find the area of the triangle.
A = 12
bh Write the formula.
A = 12
(5 · 8) Substitute 5 for b and 8 for h.
A = 20
The area is 20 in2.
A = 12
(40) Multiply.
8 in.
5 in.
#2 You Try!
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Find the area of the triangle.
A = 12
bh Write the formula.
A = 54
The area is 54 in2.
A = 12
(108) Multiply.
24 ft
4 ft12
A = 12
(4 • 24)12
Substitute 4 for b and 24 for h.
12
#3 You Try!
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#4-5 Group Practice
#4#5
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Practice ProblemsPracticing is how I won
the superbowl!
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3-2-1 Summary• 3 things you
learned about Areas so far
• 2 things that you need more practice on
• 1 thing you really like