For this case we have that by definition, the perimeter of a circle is given by:
Where:
r: It is the radius of the circle.
According to the figure, it is observed that the radius of the circle is 2. Then:
Let's remember that we have a quarter circle:
We round and we have that the correct option is
Answer:
Option A
The attached figure is the image that completes the question
The question is incomplete. Complete question along with Matlab code, explanation, and output results are given below.
Complete Question:
Develop a MATLAB script to generate a 5 panel vertical plot to illustrate how a function changes as the parameters change. On each plot, display the simple sine wave, y(t) = sin(2πt), as a red line. Then, add the following functions to each of the 5-panels as black lines:
y(t) = sin(2πt) sine function
y1(t)=1+sin(2πt) effect of mean
y2(t)=2sin(2πt) effect of amplitude
y3(t)=sin(4πt) effect of frequency
y4(t)=sin(2πt) - π/4) effect of phase shift
y5(t)=cos(2πt) - π/2) relationship between sine and cosine
Step-by-step explanation:
We are required to show different sinusoidal plots to illustrate the effects of changing mean, amplitude, frequency, phase shift, and relationship of sine and cosine wave.
t=[0:0.01:2*pi] % time vector from 0 to 2pi
y=sin(2*pi*t); % the original sine function
% effect of mean
y1=1+sin(2*pi*t);
subplot(5,1,1) % 5 rows, 1 column and last for position
plot(t,y,'k',t,y1,'r') % this function plots y and y1 with respect to time vector t
% 'k' for black color and 'r' for red color
grid on
xlabel('time (t)') % x-axis is for time
ylabel('y1(t)') % y-axis is for function value y(t)
title('effect of mean') % title of the plot
ylim([-3 3]) % limit of y-axis
xlim([0 6]) % limit of x-axis
% effect of amplitude
y2=2*sin(2*pi*t);
subplot(5,1,2)
plot(t,y,'k',t,y2,'r')
grid on
xlabel('time (t)')
ylabel('y2(t)')
title('effect of amplitude')
ylim([-3 3])
xlim([0 6])
% effect of frequency
y3=sin(4*pi*t);
subplot(5,1,3)
plot(t,y,'k',t,y3,'r')
grid on
xlabel('time (t)')
ylabel('y3(t)')
title('effect of frequency')
ylim([-3 3])
xlim([0 6])
% effect of phase shift
y4=sin((2*pi*t)-pi/4);
subplot(5,1,4)
plot(t,y,'k',t,y4,'r')
grid on
xlabel('time (t)')
ylabel('y4(t)')
title('effect of phase shift')
ylim([-3 3])
xlim([0 6])
% relationship between sine & cosine
y5=cos((2*pi*t)-pi/2);
subplot(5,1,5)
plot(t,y,'k',t,y5,'r')
grid on
xlabel('time (t)')
ylabel('y5(t)')
title('relationship between sine & cosine')
ylim([-3 3])
xlim([0 6])
Output Results:
The first plot shows that sine wave gets shifted to upper side with respect to the original sine wave.
The second plot shows that the amplitude of the sine wave is increased with respect to the original sine wave.
The third plot shows that the frequency of the sine wave is increased. The number of cycles are increased with respect to the original sine wave.
The fourth plot shows there is a phase shift between two waves. The modified sine wave lags the original sine wave by π/4
The fifth plot shows the relationship between sine and cosine wave.
As we know sin(2πt)=cos(2πt - π/2)
Therefore, both waves are superimposed on each other since they are equal.
