You fly a hot air balloon 0.5 miles above the ground. What is the measure of BD⌢, the portion of Earth that you can see? Round y
our answer to the nearest tenth. (Earth's radius is approximately 4000 miles.)
PLEASE HELP ASAP!
PLEASE HELP ASAP!
1 answer:
Step-by-step explanation:
To solve this problem, we need the angle CAD, which can then be used to calculate the arc BD.
From definition of cosine,
cos(x) = adjacent / hypotenuse
cos(x) = AD / AC = 4000 / 4000.5 = 0.9998750156230471
The inverse function gives
x = arccosine (4000/4000.5)
= arccosine (0.9998750156230471)
= 0.01581056485742214 radians = 0.9058786380481468 degrees
Radius of the earth, r = 4000 miles
Arc BD = 2 time arc subtended by angle x
= 2 (rx) where x is in radians
= 2*4000*0.01581056485742214
= 126.48 miles (to two decimal places)
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B. The total area painted is 864; they must buy two cans of paint.
Step-by-step explanation:
Step 1:
A rectangle's area can be calculated by multiplying its length and its width. The wall is made up of 5 different types of rectangular walls. All walls are 8 feet tall but the length varies.
Step 2:
The area of the 20 feet long wall =
The area of the 10 feet long wall =
The area of the 5 feet long wall =
The area of the 4 feet long wall =
The area of the 15 feet long wall =
The area of all the walls = 432 square feet.
Since there are two sides for every wall, total area = square feet.
Step 3:
If one paint can covers 500 square feet,
the number of cans required to paint 864 square feet = cans.
so 2 paint cans are needed to paint 864 square feet which is option B.