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Trapezoids
Euclidean Geometry
High School
Math Online
Definition
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A trapezoid is a quadrilateral with exactly
one pair of parallel opposite sides.
Parts of a Trapezoid
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The parallel sides are called the bases.
The nonparallel sides are called the legs.
base
leg
leg
base
Isosceles Trapezoid
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Definition: A trapezoid with congruent legs
Properties of Isosceles Trapezoid
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Each pair of base angles is congruent
Diagonals are congruent
Median of a Trapezoid
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A segment joining the midpoints of the
legs
Length of the median is equal to ½ times
the sum of the bases
Area of a Trapezoid
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Area = ½h (b1 + b2)
H = height of the trapezoid
B1 = one of the bases
B2 = the other base