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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 Presentation
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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
Corny Joke of the Daya tribute to Tanner to week
What is invisible and smells like Bananas?
“A monkeys burb”
Measurement Retest
Reteach: WEDNESDAY
Retest: FRIDAY
Homework Answers
Can you find my mistakes?
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
Which Area formula matches the shape?
2. a=lw1. a=s² 2. a=bh
Flashcard Make one flashcards:
1.Area of a Parallelogram
a=bhA=Base x Height
Base
Height
Describe how finding the area of the parallelogram is like finding
the area of a rectangle.
Why does this work?
Triangle Investigation
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
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?
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
Helpful Hints
1. Formula can be written as:
2. The base and the height must form right angles!
2
bhA
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
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!
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!
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!
#4-5 Group Practice
#4#5
Practice ProblemsPracticing is how I won
the superbowl!
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
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