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12. Point O is the centre of the circle. Determine the values of x" and je. 13. Point O is the centre of the circle; OF = 18 cm; and GJ = 14 cm. Determine the values of xand y to the nearest tenth of a centimetre where necessary. 14. A circle has diameter 70 cm. A chord in the circle is 50 cm long. How far is the chord from the centre of the circle? Give the answer to the nearest tenth of a centimetre. 15. A circle with radius 10 cm has a chord with length 12 cm. How far from the centre of the circle is the chord? Draw a diagram to support your solution.16. A circular water pipe has a diameter of 13 feet. The surface length of water in the pipe is 7 feet and its depth is less than 6.5 feet. Determine the exact maximum depth of the water. 17. Draw and label a diagram to illustrate each property. a. an inscribed angle and a central angle subtended by the same arc b. inscribed angles subtended by the same arc c. an angle inscribed in a semicircle 18. Point O is the centre of each circle. Determine the values of x" and jo. Justify your solutions. b) c)