Step-by-step explanation: As we know, the relationship between the diameter and radius, is that it is 2 times the amount of it. Now in your particular equation, 36 is radius^2. So all we have to do, is take the square root of 36, and then multiply that number by 2, to find the diameter. The square root of 36 is 6, so 6 x 2= 12 m, which is the diameter.
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Because K is the midpoint of JL and JK = 18, KL must also equal 18. So the equation would be 3x - 15 = 36 because you add 18 + 18. You then add 15 to both sides to get 3x = 51. Then you divide by 3 on both sides to get x = 17.
