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# Geometry Glossary - I a|b|c|d|e|g|h|i|k|l|m|o|p|q|r|s|t|v|x|y|

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# indirect proof:

A proof which assumes that the desired conclusion is not true and shows that this assumption leads to a contradiction.

# inductive reasoning:

Generalizations based on repeated observations.

# inscribed angle:

An angle whose vertex lies on a circle and whose sides contain chords of the circle.

# inscribed circle:

A circle about which a polygon is circumscribed.

# inscribed polygon:

A polygon whose sides are chords of a circle.

# intersection:

A set of points contained in two or more intersecting figures.

# intercepted arc:

The arc TB is called the intercepted arc of inscribed angle ACB.

# inverse:

The statement formed by negating the hypothesis and the conclusion.

# isometry:

A transformation that is distancepreserving. The distance between two points is the same as the distance between the corresponding images of these points.

# isosceles trapezoid:

A trapezoid with congruent legs.

# isosceles triangle:

A triangle with at least two congruent sides.

Note: The terms in this collection may not be entirely accurate.
They are for reference only.