Condition for two circles to intersect orthogonally — A/L Combined Mathematics

What should I read on Condition for two circles to intersect orthogonally?

Work through these in order. Resources in English, Sinhala and Tamil.

1. 1. Start here · Interactive tool
   GeoGebra Geometry — Orthogonal Intersection of Two Circles (2g1g2 + 2f1f2 = c1 + c2)

   This link opens the tool itself — you build the example. It follows its publisher's own syllabus, not the NIE syllabus.

   A free graphing and geometry tool. Use it to draw the figure or graph yourself and test what changes when you move a point or a value.

   Source: GeoGebra — Interactive Geometry Suite
2. 2. Then · Official syllabus resource
   NIE Sri Lanka — syllabuses and teacher guides

   This link opens the site's home page. Search there for: Orthogonal Circles and Power of a Point

   The National Institute of Education publishes the official syllabi and teacher guides. Use it to confirm exactly what the syllabus asks for on this topic.

   Source: National Institute of Education, Sri Lanka (NIE)

Next in the syllabus

Where does Condition for two circles to intersect orthogonally fit in the syllabus?

Year 1 · Term 3