The area of a circle is 36cm^2 (2 is the exponent)
1 answer:
Answer:
a) 3.39 cm b) 21.29 cm
Step-by-step explanation:
ok so the area of a circle is r^2.
if the area is 36 cm^2 we can divide it by 3.14, which is pi (). that gives us 11.46. now we find the approximate square root of this.
this is approximately equal to 3.39. the radius is about 3.39cm.
now that we know the radius, we can easily find the circumference. the formula for this is d. the diameter is just the radius times 2. (3.39)(2)
we plug the numbers into the formula: 3.14(6.78)=21.29 cm =d
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Answer:
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Step-by-step explanation:
Graph (-5,-3) and use the slope, -2, to find another point. -2 can also be written as
and
**
Use both. This works because either way, they will lie on the same line with the same slope. So, starting at (-5,-3), go down two points (-)* and to the left 1 (+)*, then, starting at (-5,-3) again, go up two points (+)* then to the right 1 point (-)*.
* If the number is negative, you either go down or to the right. If the number is positive, you go up and to the left.
**Rise over run refers to the change in the y-axis and the change in the x-axis: . Only one number is negative because, if both were negative, that would make a positive number, but the slope is -2, not 2.
Another way you could do this is by finding points first. All you need to do is turn the slope into a "point". Remember, 2 is the y and 1 is the x:
and
Then, using (-5,-3) and your new points, add them separately:
(-4,-5) is one point
(-6,-1) is another point. Connect the three points. You can check your work on the graph:
