For B, the equation for circumference is pi multiplied by diameter. So, 10 * 2 = 20, and 20*3.14 is 62.8 cm
For C, assuming that "approximate" means that they used 3.14 for pi, then 81.64 / 3.14 = 26, and 26 / 2 = 13 cm
Answer:
AD/AB = AB/AC
Step-by-step explanation:
If we take two triangules in that figure: ABC and ABD, both are triangles rectangles. We need to use the definition of cosine, with the angle in th A corner, we called ∅.
For the ABC triangle: cos(∅) = adjacent cathetus/hypotenuse = AD/AB
For the ABD triangle: cos(∅) = adjacent cathetus/hypotenuse = AB/AC
Then:
cos(∅) = AD/AB = AB/AC
Answer:
A) A = W(W + 4)
B) Length = 7 ft
Width = 3 ft
Step-by-step explanation:
A) Let the length and width of the rectangular rug be L and W respectively.
We are told that the rug is 4 feet longer than it is wide. Thus;
L = (W + 4)
Also we are told that the area is 21 ft²
Now, formula for area of a rectangle is;
A = LW.
Thus;
A = W(W + 4)
21 = W(W + 4)
B) 21 = W² + 4W
W² + 4W - 21 = 0
Using quadratic formula to find the roots, we arrive at W = 3 ft.
Thus, L = 3 + 4 = 7 ft
I would know ur answer but I can't really see