Answer:
then her brother would be 12 years old
You would use the sine rule. This is because the sine rule is when you know two of the angles on any triangle.
Brainliest please! <3
You need to know the properties of each function.
Tan is opposite (y) over adjacent (x). Sin>0 means that sin is positive, therefore, it is located on either quadrant 1 or 2. Tan=4/3 so it is located in quadrant 1.
The side of the triangle must be Adjacent=3 opposite=4 and hypotenuse=5
Now, you are asked to find the half angle of Cos which is

By following the formula, cos=3/5 then:

Multiply everything (inside the square

root) by 5


Then just simplify

The answer is Square root of 20 over 5
Answer:
Option D is not true
Step-by-step explanation:
Whole Numbers (W) = They include Natural numbers (N) and 0.