To subtract fractions, you need to obtain a common denominator. We can achieve this, in this case, by multiplying:

Simplify this:

Now we have common denominators, so we can easily just subtract the numerators, and we have the answer:

Notice that this is divisible by 2:

That's your answer!
Answer: 40.9
Step-by-step explanation:
Given
angle given is 

Using trigonometry

Using cosine formula

Answer:
Wut
Step-by-step explanation:
That is not a question try to read it again and put it in again or just use google lol.
Area of the whole circle = 3.14 * 7.5^2
area of the sector = (3.14 * 7.5^2 * 210) / 360
= 103 cn^2 to nearest whole number
295/110,000. Hopefully this helped.