Answer:

Step-by-step explanation:
We are given a
where 

As per trigonometric rules,


Comparing the given value of tangent and cosine:
Perpendicular = 3 units
Base = 4 units
Hypotenuse = 5 units
Also, we know that:


Now, it is given that the triangle is dilated by a scale factor of
.
i.e. all the sides will become half of its initial values.
New Perpendicular = 1.5 units
New Base = 2 units
New Hypotenuse = 2.5 units
Using the formula for sine:

