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philomath_2013_2014_geomb_vocab_02
second vocabulary list for geometry b
21
Mathematics
10th Grade
01/29/2014

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Term
30-60-90 triangle
Definition
A right triangle whose acute angles are 30o and 60o. It is the result of splitting an equilateral triangle in half using a line of symmetry.
Term
45-45-90 triangle
Definition
A right triangle whose base angles are each 45°. Because of the converse of the isosceles triangle theorem it is also an isosceles triangle.
Term
acute angle
Definition
An angle whose measure is less than 90o.
Term
base
Definition
A segment that is perpendicular to the altitude of a polygon. Rectangles, parallelograms and trapezoids have _____s in pairs that are parallel to each other.
Term
complementary angles
Definition
Two angles whose sum is 90°.
Term
leg (of a trapezoid)
Definition
One of the two non-parallel sides of a trapezoid.
Term
leg (of a right triangle)
Definition
One of the two sides that form the right angle of the right triangle.
Term
linear pair of angles
Definition
Two angles that share a vertex and a side and whose other sides form a line.
Term
midpoint of a segment
Definition
The point that is equidistant from the endpoints of the segment.
Term
obtuse angle
Definition
An angle whose measure is greater than 90o but less than 180o.
Term
parallel lines
Definition
Two coplanar lines that never intersect. On a coordinate plane their slopes are the same.
Term
parallelogram
Definition
Any quadrilateral with two pairs of opposite sides parallel.
Term
perpendicular lines
Definition
Two lines that intersect to form right angles.
Term
pythagorean triple
Definition
A set of three whole numbers, such as 3, 4 and 5, that work in the Pythagorean Theorem.
Term
quadrilateral
Definition
A polygon with four sides.
Term
rectangle
Definition
Any quadrilateral with four right angles.
Term
sector of a circle
Definition
The region enclosed by two radii and the part of the circle between the endpoints of the radii on the circle. Think of it like a piece of pie.
Term
supplementary angles
Definition
Two angles whose sum is 180°.
Term
rhombus
Definition
Any quadrilateral with four congruent sides.
Term
trapezoid
Definition
A quadrilateral with exactly one pair of parallel sides.
Term
vertical angles
Definition
Two angles formed by intersecting lines that are opposite each other.
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