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Algebra 18 Online
OpenStudy (narissa):

please help

OpenStudy (narissa):

OpenStudy (narissa):

@khalilforthewin

OpenStudy (narissa):

@acxbox22

OpenStudy (narissa):

@GenericNoodles

OpenStudy (narissa):

@Nnesha

OpenStudy (narissa):

@khalilforthewin

OpenStudy (narissa):

u know how to do this @matt101

OpenStudy (matt101):

To find the perimeter of the figure, break it down into easier shapes to work with. Let's use a rectangle and a semicircle. The perimeter of a rectangle is just 2w+2l, where w is the width and l is the length. In this case, however, the top side of the rectangle is NOT part of the perimeter of the complete shape, so we need to subtract it from the perimeter of the rectangle alone, leaving us with 2w+l. The perimeter (circumference) of a circle is given by πd, where d is the diameter of the circle. Here, we only have a semicircle, so the perimeter it adds to the shape is ½(πd). In this case, d happens to be the length of the rectangle in the figure (l). So...the total perimeter of the shape you can find by calculating 2w+l+½πl.

OpenStudy (narissa):

2*6+1+1/2*3.14?

OpenStudy (matt101):

Read my answer carefully. What's the perimeter of just the rectangle?

OpenStudy (narissa):

so its 2 *3

OpenStudy (matt101):

The equation for perimeter of a rectangle is 2l+2w. What's the perimeter of this rectangle?

OpenStudy (narissa):

13?

OpenStudy (narissa):

33?

OpenStudy (matt101):

Can you show me your calculation?

OpenStudy (narissa):

2*6*3?

OpenStudy (narissa):

is 36

OpenStudy (narissa):

im confusaed now

OpenStudy (narissa):

21*2*6?

OpenStudy (narissa):

21+2*6

OpenStudy (matt101):

Ok let's back up for a minute. What's the width of the rectangle? What's the length of the rectangle?

OpenStudy (narissa):

6 and 3

OpenStudy (narissa):

21.14?

OpenStudy (matt101):

Yes, 6 and 3. You have two sides with length 6, and 2 sides with width 3. The perimeter is the sum of all the sides, which is 2l+2w. What is the perimeter of the rectangle?

OpenStudy (narissa):

so answer is @matt101

OpenStudy (narissa):

@Mehek14

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