Find the radius of a circe given the area 25pi square inch.
1 answer:
Answer:
Radius = 5 inches
Step-by-step explanation:
1) We have to use the equation for the area of a circle to find the radius of the circle.
Area of a circle = πr^2
2) Plug in the information we already know, i.e., the area.
25π = πr^2
3) Cancel out the π on each side.
25 = r^2
4) Take the square root of 25
r =
r = 5
5) The radius is 5 inches.
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Given:
Length of rectangle = (x+10) cm
Width of the rectangle = x cm
Perimeter = 32 cm
To find:
The length of the rectangle.
Solution:
We know that,
Where, l is length and w is width.
Substituting the values, we get
Subtract 20 from both sides.
Divide both sides by
So, the length is
Therefore, the length of the rectangle is 13 cm.