Answer: c and d
Step-by-step explanation:
1 km^2 = 1000m x 1000m = 1 x 10^6 m^2
<span>(145 acres / 247 acres) x 1 x 10^6 m^2 = 5.87 x 10^5 m^2 </span>
<span>5.5 g/m^2 x 5.87 x 10^5 m^2 = 3.23 x 10^6 g </span>
<span>3.23 x 10^6 g x 1kg/10000 g = 3.23 x 10^3 kg</span>
Answer:
Step-by-step explanation:
Given
--- The radius of each
Required
The area between them
See attachment for illustration of the question. (figure 1)
First, calculate the height of the equilateral triangle formed by the 3 radii (See figure 2)
Using Pythagoras theorem, we have:
Collect like terms
Take square roots
Expand
Split
Now, the area of the equilateral triangle can be calculated using:
Where
Next, is to calculate the area of the sector formed by 2 radii in each circle (figure 3).
Since the radii formed an equilateral triangle, then the central angle will be 60. So:
For the three circles, the area is:
Subtract the areas of the sectors (A2) from the area of the equilateral triangle (A1), to get the area between them.
Approximate