# Chord geometry

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27 questions all stuffed in to the same circle gives students a real challenge. This puzzle is great for any high school geometry lesson on circles. It contains angles with their vertex in the circle, on the circle, and outside of the circle. These angles are all made using diameters, chords, secants and tangents.

Ptolemy of Alexandria compiled a more extensive table of chords in his book on astronomy, giving the value of the chord for angles ranging from 1/2 degree to 180 degrees by increments of half a degree. The circle was of diameter 120, and the chord lengths are accurate to two base-60 digits after the integer part

★♥★ #Circle Facts ★♥★ Learn some interesting information about this two…

### Circle Theorems - Complete Unit of Work

In this unit, students will use circle theorems to solve angle problems. They will learn how to prove and use the facts that the angle in a semi-circle is 90, that the angle formed at the centre of a circle is double the angle formed on the circumference, that angles in the same segment are equal, that a perpendicular from the centre of a circle to a chord bisects the chord, that opposite angles in cyclic quadrilaterals are equal, that a tangent and a radius make a right angle, that two…

### Circles: inscribed angles - foldable for interactive notebooks

This is a foldable for notes on Inscribed Angles of Circles. The notes include properties of inscribed angles and tangent lines and chords and 9 examples. This also includes the SMART NOTEBOOK file with the foldable. Also this includes a set of 8 practice problems on a half sheet for interactive notebook.