The triangle below has a height of 12 feet and a base of 9 feet. What is the area of the triangle?
A.108
B.54
C.21
D.30
B?
If the area of a square is 81 square meters which formula would you use to calculate the perimeter of the square?
A.p=lxw
B.p=s+s
C.p=4(s)
D.Not here
C?
The circumference of this circle is approximately 66 inches. What is the radius?
A.33
B.22
C.11
D.Not here
D?
I don't know the diameter.
But you do know the circumference. And you know the value of pi.
Oh. Because I was using the formula radius=C/2 pi
To find the area of a triangle, you can use the formula: Area = (1/2) * Base * Height. Given that the base is 9 feet and the height is 12 feet, you can plug these values into the formula:
Area = (1/2) * 9 * 12
Area = 54 square feet
Therefore, the correct answer is B. 54.
To calculate the perimeter of a square, you would use the formula: Perimeter = 4 * Side length. With a square, all sides are equal. Given that the area is 81 square meters, you could find the side length by taking the square root of the area: Side length = sqrt(Area).
Side length = sqrt(81) = 9 meters.
Then, you can plug the side length into the perimeter formula:
Perimeter = 4 * 9 = 36 meters
Therefore, the correct answer is C. 4(s).
The circumference of a circle is given by the formula: Circumference = 2 * π * Radius. In this case, you are given the circumference as approximately 66 inches.
Circumference = 2 * π * Radius
66 = 2 * π * Radius
To solve for the radius, you can rearrange the formula:
Radius = (Circumference) / (2 * π)
Radius = 66 / (2 * π)
Radius ≈ 10.477 inches
Since none of the given options match the calculated radius, the correct answer would be D. Not here.
The first two are correct. Your last one isn't right.
C = pi * d