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mayrabris2cute
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plz help @cgreenwade2000
mathstudent55
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You have an 8-cm by 5-cm rectangle plus a half circle with 4 cm radius.
Do you know the folrmulas for the areas of a rectangle and a circle?
mayrabris2cute
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I know formula for the area of a circle....
mathstudent55
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Ok, so you need half the area of a circle with radius 4 cm.
The area of a rectangle is A = LW, where L = length and W = width
mayrabris2cute
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A = pi x r^2
mathstudent55
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Right. Calculate that and divide by 2 because you have only half a circle. Then add that to A = LW, with L = 8 cm and W = 5 cm, which is the area of the rectangle.
mayrabris2cute
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I really need to hurry!!!! I can't in time!!!!!
mayrabris2cute
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3.15 * 8 = 25.2
mathstudent55
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|dw:1358454216136:dw|
mayrabris2cute
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Oh no! I have to go! I'll just get the answer wrong :/
mayrabris2cute
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Yes....
mathstudent55
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That's good. You have the area of the half circle. Now you need to calculate the area of the rectangle and add the two areas.
mayrabris2cute
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So 40 + 25.2 = 65.3. That's the answer?
mayrabris2cute
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But 65.3 isn't an answer choice.
mathstudent55
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40 + 25.1 = 65.1
mathstudent55
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You got it! Good work.
mayrabris2cute
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The answer is 6.1. I just did it and got it right!
mayrabris2cute
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Alright! Thx! :D
mathstudent55
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wlcm