geometry
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9 Terms
Square
a quadrilateral all of whose sides and angles are equal
rhombus
a quadrilateral all of whose sides are equal
rectangle
a quadrilateral each of whose angles is a right angle
trapezoid
a quadrilateral that has exactly one pair of parallel sides
midsegment
a line segment that connects the midpoints of two of its sides
parallelogram
a quadrilateral whose opposite sides are parallel
Postulate 8
every polygonal region has a positive number called its area such that 1 congruent triangles have equal areas 2 the area of a polygonal region is equal to the sum of the areas of its non-overlapping parts
Postulate 9
the area of a rectangle is the product of its base and altitude
Midsegment Theorem
A midsegment of a triangle is parallel to the third side and half as long