After all, we did love playing a prank on him.
so the answer is 15°
the circle is 360°
one green angle is 50°
so 4 green angles equals 200°
so 360 minus 200 equals 60.
so 60° angle. and as a result the rest of the angles are 60° of the circle. and so each of the angles are... 15° if the 60 is divided by 4.
You did not provide the excerpt but I wound it and the correct answers are the following two sentences:
1.<span>For once, at least, I grasped the mental operations of the Morlocks.
Here we see that they do possess a kind of intelligence, maybe at first strange and unclear but it is there, no matter how strange it might seem.
2.</span><span>I was surprised to find it had been carefully oiled and cleaned.
Here the Time Traveler has found his Time Machine and he finds that the Morlocks had tried to grasp its function and its purpose. They have taken it apart and then cleaned and oiled it, which suggests they know somethings about how the machine work.
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Douglass said Mr. Covey turned him into a brute. He felt horrible about himself and was left feeling broken.

The harmonic frequency refers to the resonant frequency that is an integral multiple of the fundamental frequency, harmonics are usually simple sinusoidal oscillation at a single frequency. where as Resonance frequency are frequencies that are not necessarily sinosudal or integral multiple of fundamental frequency and it may have complex oscillations made up of multiple harmonics ~
It's like if you play a piano with a single key, it will show harmonic frequency, but if you use multiple keys at a time it may show Resonance.