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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p. 54

To answer that let’s look at how the area of a circle relates to the area of a square…

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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

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

A fun way to remember formulas for circumference and area of a circle…

HW: WS - Circles: Area & Circumference + SBAC practice