Geometry always, sometimes, never

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Always

If points C, D, and E are not collinear, then point C and line AB define a unique plane

Sometimes

If two sides of one triangle are proportional to two sides of another triangle, the triangles are similar

sometimes

Opposite sides of a trapezoid are parallel

always

two intersecting lines form a plane

sometimes

two lines that never intersect are parallel lines

Always

Two isosceles triangles are similar to an equilateral triangle

Always

Two planes that are perpendicular to the same plane are perpendicular to each other

Always

Two right triangles are similar if both legs of one are proportional to the legs of the other

Never

a parallelogram has both pairs of opposite angles supplementary

sometimes

a quadrilateral with diagonals that are perpendicular bisectors of each other is a square

always

as the number of sides of a regular polygon increases, the measure of each exterior angle decreases

always

if a parallelogram has one right angle then it is a rectangle

always

the diagonals of a square are congruent

Never

the diagonals of a trapezoid bisect each other

Never

the intersection of two planes is a point


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