How to find angle between two perpendicualt lines in opencv

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Python

OpenCV

i have two perpendicualr lines how to draw the Angle between them

What I have tried:

mport numpy as np
import cv2

btn_down = False

def get_points(im):
# Set up data to send to mouse handler
data = {}
data['im'] = im.copy()
data['lines'] = []

# Set the callback function for any mouse event
cv2.imshow("Image", im)
cv2.setMouseCallback("Image", mouse_handler, data)
cv2.waitKey(0)

# Convert array to np.array in shape n,2,2
points = np.uint16(data['lines'])

return points, data['im']

def mouse_handler(event, x, y, flags, data):
global btn_down

if event == cv2.EVENT_LBUTTONUP and btn_down:
#if you release the button, finish the line
btn_down = False
data['lines'][0].append((x, y)) #append the seconf point
cv2.circle(data['im'], (x, y), 3, (0, 0, 255),5)
cv2.line(data['im'], data['lines'][0][0], data['lines'][0][1], (0,0,255), 2)
cv2.imshow("Image", data['im'])

elif event == cv2.EVENT_MOUSEMOVE and btn_down:
#thi is just for a ine visualization
image = data['im'].copy()
cv2.line(image, data['lines'][0][0], (x, y), (0,0,0), 1)
cv2.imshow("Image", image)

elif event == cv2.EVENT_LBUTTONDOWN and len(data['lines']) < 10:
btn_down = True
data['lines'].insert(0,[(x, y)]) #prepend the point
cv2.circle(data['im'], (x, y), 3, (0, 0, 255), 5, 16)
cv2.imshow("Image", data['im'])


# Running the code
img = cv2.imread("98.jpg", 1)
pts, final_image = get_points(img)
cv2.imshow('Image', final_image)
print (pts)
cv2.waitKey(0)