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YC is the perpendicular to AB .

A. B. C. An angle of 90° at a given point on a line. Task: C is a point on line AB. Task: C is a point on line AB. Construct an angle of 90° at C. Task:. Conclusion:. Construction:. Join CY. Mark any point O outside AB. Join XO and produce it to meet the circle at Y.

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YC is the perpendicular to AB .

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  1. A B C An angle of 90° at a given point on a line Task: C is a point on line AB. Task: C is a point on line AB. Construct an angle of 90° at C. Task: Conclusion: Construction: • Join CY. • Mark any point O outside AB. • Join XO and produce it to meet the circle at Y. • Centre O, radius OC, draw an arc to cut AB again at X. • YC is the perpendicular to AB. Y • YCB is 90°. O X

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