The formula of a diameter d of a square with side a:
Substitute 
:
<em>multiply both sides by 
</em>
<em>used 
and 
</em>
<em>use </em>
<em>divide both sides by 2</em>
The perimeter: 
Substitute:
<h3>Answer: D.</h3>
Other method.
Use the Pythagorean theorem:
<em>use 
</em>
<em>divide both sides by 2</em>
Step-by-step explanation:
3x + 4 < -7
3x < -7 - 4
3x < -11
x < -11/3 ≈ -3,666
x = {3,2,1,0, etc}
Answer: ~14°, ~62°
Step-by-step explanation:
See image. You should be able to easily calculate the last two angles.
