If a circle has a radius of
, it is true that: <u>D. The </u><u>circumference </u><u>of the </u><u>circle </u><u>is </u>
<u />
<em><u>Recall the following about a </u></em><em><u>circle</u></em><em><u>:</u></em>
- Area of a circle =

- Circumference of a circle =

If a circle has a radius of
, the area and circumference of the circle would be the following:
- Area of a circle =

- Substitute
into the area formula


- Circumference of a circle =

- Substitute
into the circumference formula

Therefore, if a circle has a radius of
, it is true that: <u>D. The </u><u>circumference </u><u>of the </u><u>circle </u><u>is </u>
<u />
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Answer:
(C) 
Step-by-step explanation:
Here we have the formula for the area of a triangle:
. Our goal is to isolate h on one side of the equation.
To do this, let’s treat the rest of the equation as if there were no variables.
Multiply both sides by 2:

Divide both sides by
:

Hope this helped!
Area of rectangle is 
<u>Explanation:
</u>
Given width = 15cm ,
Perimeter of rectangle = 2x(length + width)
According to the question,

Hence,
Area = length X width = 
Therefore,
Area of rectangle is 
Answer:
x=9
y=6
Step-by-step explanation:
x+y=15 .............(i)
x-y=3...........(ii)
Subtracting equation (ii) from equation (i)
or, x+y -(x-y)=15-3
or, x+y-x+y=12
or, 2y=12
or, y=12/2
∴y=6
Now,
Putting the value of y on equation (i),
or, x+6=15
or, x=15-6
∴x=9