An isosceles triangle is a triangle that has 2 equal sides and 2 equal angles.
side XY = side XZ
∠Y = ∠Z
Since ∠Y = a° then ∠Z = a°
Because interior angles of a triangle sum up to 180°, we simply need to find the difference between 180° and the 2 known angles to solve for the measure of angle X.
∠X = 180° - 2a°
Answer:

Step-by-step explanation:
Given:
Rate of change of radius of cylinder:

(This is increasing rate so positive)
Rate of change of height of cylinder:

(This is decreasing rate so negative)
To find:
Rate of change of volume when r = 20 inches and h = 16 inches.
Solution:
First of all, let us have a look at the formula for Volume:

Differentiating it w.r.to 't':

Let us have a look at the formula:


Applying the two formula for the above differentiation:

Now, putting the values:

So, the answer is: 
Answer:
C. y+5=-4(x-2)
Step-by-step explanation: