Answer:
Step-by-step explanation:
Given that,
The diameter of a leather ball, d = 28.4 cm
Radius, r = 14.2 cm
We need to find the area of the piece of leather used on the surface of the ball. The surface area of the ball is given by :
So, the area of the piece of leather is . The correct option is (b).
Answer:
4
Step-by-step explanation:
Gave a picture to explain
Answer: The first option.
Step-by-step explanation:
1. To solve this exercise you need to remember that:
- An even function is a function with the following property:
f(-x)=f(x)
- An odd function is a function with this property:
f(-x)=-f(x)
2. By definition, the contangent is an odd function, therefore you have that:
cot(-θ)=-cot(θ)
Then:
3. So, you can coclude that the first step is wrong. Therefore, the answer is the first option.