Altitude of a triangle (height)
The perpendicular segment from a vertex to the line containing the opposite side of a triangle.
Altitude of a trapezoid (height)
The distance between the bases of a trapezoid.
Geometry shape formed by two rays (initial and ending sides of the angle) that share a common endpoint called the vertex. You may name an angle using the vertex, or a point in each ray and the vertex label in the center.
The amount of space taken up in a plane by a figure.
The side of an isosceles triangle whose endpoints are the vertices of the base angles.
The angle opposite one of the equilateral sides in an isosceles triangle.
Base of a trapezoid
The parallel sides of a trapezoid.
A triangle whose sides are equal in length.
A triangle with two sides of equal length.
Trapezoid with two non-congruent and non-parallel sides.
An angle whose measure is greater than 90 but less than 180 degrees.
A triangle with one acute angle.
Any quadrilateral with two pairs of opposite sides parallel.
It is a closed plane figure with a least three straight segments as sides.
A four-sided polygon.
A triangle that has a 90 degree angle.
Any parallelogram with 4 congruent sides.
A triangle with no equilateral sides.
An equilateral and equiangular quadrilateral.
A polygon with three sides.
Quadrilateral with exactly one pair of parallel sides.
Interactive Geometric Applets: Relevant Theorems.
A rhombus has all the properties for a parallelogram. You have opposite
sides congruent, and parallel. It has diagonals that bisect each other.
Its diagonals are perpendicular, and angle bisectors.
Review these properties before solving areas for rhombi.
A square is a parallelogram with all properties of the rhombus and the rectangle.
You have that all squares are a special rhombus, and a special rectangle; but not all
rhombi, and rectangles are squares. Reviewing it will help you finding areas for squares.
The Isosceles Trapezoid is different to other quadrilaterals. You have one pair of parallel sides,
and one pair of congruent sides. Opposite angles are supplementary, and top and bottom
base angles are congruent. All these reasons sets it apart from the parallelograms.
It would be very helpful to review them before solving for areas in trapezoids.
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