The total length of mid-ocean ridge spreading centers is about 80,000 km. The average spreading rate of ridges is 1.25 cm/yr. Calculate the area of new ocean crust that forms each year.​

-81 -56 -27 0 81

step-by-step explanation:

alright so i think for this one it would to draw it out. this may be hard for me to try and draw, but i will do my best on here:

        r

  /       |     \

notice how it forms 2 triangles inside one bigger triangle.

so if we know the angle spr is the same as psr that is saying the measure of angle p is the same as angle s. this means the big triangle psr is either isosceles or equilateral. in both cases, the triangle is perfectly symmetrical when split down the middle, which is in this case rq. because we know it is perfectly symmetrical on both sides, we know that the two triangles inside the bigger one are equal.

this would be 35. 35 + 5 = 40. you take the known constant and subtract by the answer of the equation and you get y.