Question 1: I'm 90% sure that the answer is D.
Question 2: The answer is C.
Question 3: x = 20°
I hope these answers are right. I am currently taking geometry, and doing well, but sometimes I don't know what I'm doing.
Answer:
A = 4x^2 + 120x
Step-by-step explanation:
(39+2x)(21+2x)-(39*21) = 819 + 78x + 42x + 4x^2 - 819
A = 4x^2 + 120x
the sum of all interior angles in a polygon is
<h2>180( n - 2), n = number of sides</h2>
we know this one is a PENTAgon, so it has 5 sides, so the total for the interior angles will be
180( 5 - 2) = 540 degrees.
540° - 88° - 118° - 132° - 100° = 102° <- fifth angle.
Let the original volume be pi *r^2* h where r = radius and h = height.
The new volume will be pi *(2/5 r)^2 * 4h = pi*4/25 r^2 4h
pi*4/25r^2 * 4h / pi r^2 h = 4/25 * 4 = 16/25
The volume has been reduced by factor of 16/25.