What is the surface area of the right cone below?

OPTION A

Step-by-step explanation:

The formula that is used to calculate the surface area of a cone is:

Where "r" is the radius and "l" is the slant height.

You can identify in the figure that:

Then, you need to substitute these values into the formula .

Therefore, the surface area of this right cone is:

(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

1 x=22.52

2: 65/39=604+39x

65x-39x=604

26x=604

x=604/26

×=23.23