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Easy: Intersecting chords
When two chords cross inside a circle, the two pieces of one chord multiply to the same product as the two pieces of the other: AE × EB = CE × ED. From a point outside, a tangent squared equals the outside part of a secant times the whole secant: PT² = PA × PB.
Find the value of x.
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When two chords cross, the products of their parts are equal: AE × EB = CE × ED.
From an outside point, the tangent squared equals the whole secant times its outside part: PT² = PA × PB. Use the whole secant, not just the part inside the circle.
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