WILL GIVE BRIANLIEST!! plato

A.

Step-by-step explanation:

From Geometry, we know that the area of the triangle () is equal to:

(1)

Where:

- Base.

- Height.

By Pythagorean Theorem, we derive expressions for the base and the height of triangle. That is:

(2)

(3)

By (2) and (3), we expand (1):

Hence, correct answer is A.

b) the dogs need to shift their focus to human scent.

use this formula:

p(a\b) = p(a and b)/p(b).

take it from here.