The formula for the area, a, of a circle is a = πr2 , where r is the circle’s radius, and the formula for the circumference, c, of a circle is c = πd , where d is the circle’s diameter. which statement is correct?

The formula for the circumference, C, of a circle is C = πd , where d is the circle’s diameter.

Step-by-step explanation:

For a circulus with radius r, we have that:

The area of the circulus is:

That is, the radius is squared, not multiplied by 2, so the first statement is incorrect.

The circumference of the circulus is:

The derivative of the area, so

However

The radius if half the diameter. So

So the correct statement is:

The formula for the circumference, C, of a circle is C = πd , where d is the circle’s diameter.

step-by-step explanation:

(sin 42)/31. = sinx)/37

sinx = 37 (sin42)/31

= 37× 0.66/31 = 0.787

x= 51.9

other angle opposite to y = 180-51.9-42

= 180- 93.9 =86.1

so

sin42)/31 = sin 86.1)/y

0.021 = 0.997 /y

y= 0.997/0.021 =47.47