Hello!
The radius is the distance from the center of a circle to the edge of a circle. The diameter is the distance across the center. The radius is always half of the diameter, as it is halfway across the circle.
I hope this helps!
Answer:
1) akram : shazia
20-4 : 15-4
16 : 11
2) akram : shazia
20 + 5 : 15 + 5
25 : 20
5 : 4
3) ratios are not always constant
Check the picture below
make sure your calculator is in Degree mode.
Answer:

Step-by-step explanation:
we have

For 
substitute the value of x and the value of y in the expression




