The formula for finding the circumference of a circle is:
C = πd
where C is the circumference, π is pi (approximately 3.14), and d is the diameter.
In this problem, we are given that the circumference is 22cm, and we are asked to find the diameter. So we can rearrange the formula to solve for d:
d = C/π
Plugging in the given values, we get:
d = 22/ (22/7)
d = 7cm
Therefore, the diameter of the circle is 7cm.
Given that the circumference of a circle is 22cm, calculate its diameter (take π as 22/7)
9 answers
If 45% of a number N is 126. Find N
We can solve this problem using the formula:
Part/Whole = Percent/100
In this problem, we know that 45% of some number N is equal to 126. So, we can set up the equation:
126/N = 45/100
To solve for N, we can cross-multiply:
126 x 100 = 45N
12,600 = 45N
Dividing both sides by 45, we get:
N = 280
Therefore, the number N is 280.
Part/Whole = Percent/100
In this problem, we know that 45% of some number N is equal to 126. So, we can set up the equation:
126/N = 45/100
To solve for N, we can cross-multiply:
126 x 100 = 45N
12,600 = 45N
Dividing both sides by 45, we get:
N = 280
Therefore, the number N is 280.
Find the perimeter of a square whose area is 225cm^2
We know that the formula for the area of a square is:
A = s^2
where A is the area and s is the length of one side of the square.
In this problem, we are given that the area is 225cm^2, so we can solve for s:
225 = s^2
Taking the square root of both sides, we get:
s = 15
Therefore, each side of the square is 15cm long.
To find the perimeter, we can use the formula:
P = 4s
where P is the perimeter and s is the length of one side. Substituting 15 for s, we get:
P = 4 x 15
P = 60
Therefore, the perimeter of the square is 60cm.
A = s^2
where A is the area and s is the length of one side of the square.
In this problem, we are given that the area is 225cm^2, so we can solve for s:
225 = s^2
Taking the square root of both sides, we get:
s = 15
Therefore, each side of the square is 15cm long.
To find the perimeter, we can use the formula:
P = 4s
where P is the perimeter and s is the length of one side. Substituting 15 for s, we get:
P = 4 x 15
P = 60
Therefore, the perimeter of the square is 60cm.
Find the value of 25% of 6 plus 10
To find the value of 25% of 6, we can multiply 6 by 25% (written as 0.25):
25% of 6 = 0.25 x 6 = 1.5
So 25% of 6 is 1.5.
Adding 10 to 1.5, we get:
1.5 + 10 = 11.5
Therefore, the value of 25% of 6 plus 10 is 11.5.
25% of 6 = 0.25 x 6 = 1.5
So 25% of 6 is 1.5.
Adding 10 to 1.5, we get:
1.5 + 10 = 11.5
Therefore, the value of 25% of 6 plus 10 is 11.5.
Evaluate 0.49 * 0.55 * 10^3
Multiplying 0.49 and 0.55 gives:
0.49 * 0.55 = 0.2695
Multiplying the result by 10^3 is equivalent to moving the decimal point three places to the right:
0.2695 * 10^3 = 269.5
Therefore, the value of 0.49 * 0.55 * 10^3 is 269.5.
0.49 * 0.55 = 0.2695
Multiplying the result by 10^3 is equivalent to moving the decimal point three places to the right:
0.2695 * 10^3 = 269.5
Therefore, the value of 0.49 * 0.55 * 10^3 is 269.5.
17 answers