quick start expectations 1.fill in planner and hwrs hw: ws: circles: area & circumference + sbac...
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Quick Start Expectations1. Fill in planner and HWRS HW:
WS: Circles: Area & Circumference + SBAC practice2. Get a signature on HWRS3. On desk: journal, vocab toolkit, LS packet, calculator
4. Warm Up: (back of HWRS)
1) Solve the equation:-3(m - 2) = 12-3m + 6 = 12 - 6 = - 6-3m = 6÷ -3 ÷ - 3 m = - 2
2) Find the circumference if the radius is 4.5 in.Formula: C = d(3.14) d = 2r C = 2(4.5) (3.14)
C = 9(3.14) C = 28.26 in.
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To answer that let’s look at how the area of a circle relates to the area of a square…
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p. 54
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A =
The area of a circle will be about 3 times the area of the radius square.
Formula…
= A
Add Area of a circle to your Vocab Toolkit
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9” 12” 15”
What is the area of each pizza?
If the pizzas cost: 9” - $6, the 12” - $10 , 15” - $15,which pizza is the best value? Why?
𝑨=𝝅 𝒓𝟐
4.5 x 4.5 x 3.14 = 63.59 in²
6 x 6 x 3.14 = 113.04 in²
7.5 x 7.5 x 3.14 = 176.63 in²
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A fun way to remember formulas for circumference and area of a circle…
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HW: WS - Circles: Area & Circumference + SBAC practice
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