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Masja [62]
3 years ago
6

I just can't figure this out! Can you help me?

Mathematics
1 answer:
vova2212 [387]3 years ago
8 0

Answer:

31.4 cm

62.8 cm

Step-by-step explanation:

<u>The radius of the inner circle is 5 cm</u>.  The line from the edge of the outer circle to the edge of the inner circle is 5 cm.  Assuming that the center of the outer center is the same as the center of the inner circle, <u>the radius of the outer should be 10 cm.</u>

Use the formula for circumference since you have the radius.

<u>Inner circle</u>

<em>C = 2πr</em>

<em>C = 2π(5)</em>

<em>C = 10π</em>

C = 31.4 cm

<u>Outer Circle</u>

<em>C = 2πr</em>

<em>C = 2π(10)</em>

<em>C = 20π</em>

C = 62.8 cm

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What is the surface area and what do I need to do?
kari74 [83]

check the picture below, that's pretty much the same block, or "rectangular prism", with a width of 10, length of 5 and height of 1.


so anyhow, is really 6 rectangles stacked up to each other at the edges, so, we can simply get the area of each of those rectangles, add them up and that's the surface area.


front and back, two rectangles of  5x1

left and right, two rectangles of 1x10

top and bottom, two rectangles of 10x5


\bf \stackrel{\textit{front and back}}{2(5\cdot 1)}+\stackrel{\textit{left and right}}{2(1\cdot 10)}+\stackrel{\textit{top and bottom}}{2(10\cdot 5)}

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3 years ago
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4 years ago
The oven tray is 600mm by 500mm. A cake tin is 25cm in diameter. How many cake tins can jenny fit on the oven tray at one time?
MAXImum [283]
We have to convert the measurements
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6 0
3 years ago
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A=244in2<br> H=<br> B=12.6in<br> (1in=2.54cm)
pshichka [43]
Although there is no picture, I will assume this is a triangle we are talking about since the terms base and height are being used. If that is the case, the height is roughly 38.72in. 

To find this, we will use the area of a triangle formula. 

1/2bh = a ---> plug in known values. 
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6.3(h) = 244 ----> divide both sides by 6.3
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6 0
4 years ago
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