# Corsa Chapter 4 Vocab

### 35 terms by lcorsa

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### acute angle

an angle with measure greater than 0 degrees and less than 90 degrees

### acute triangle

a triangle in which all three angle measures are less than 90 degrees

### area

the measure in square units of the interior region of a plane figure or the surface of a three dimensional figure

### area of triangle

base times height and divide by two

### base

a special side of a polygon used to compute area

### composite figure

a shape made of several simpler figures

### diagonal

a segment that joins two vertices of a polygon and is not one of the sides

### division

inverse of multiplication

### equilateral triangle

triangle with all three sides the same length

### height

the perpendicular distance between two bases, or a vertex and a base

### hexagon

a polygon with 6 sides

### isosceles triangle

a triangle with at least two sides equal in length

### line segment

a part of a line with endpoints

### obtuse angle

an angle greater than 90 degrees and less than 180 degrees

### octagon

a polygon with eight sides

### parallel

two lines which never intersect and are the same distance apart

### parallelogram

a quadrilateral with opposite sides parallel

### pentagon

a polygon with five sides

### perpendicular

lines, segments or rays that intersect to form right angles

### polygon

a two dimensional closed figure with straight line segments connected end to end

a polygon with four sides

### ray

a portion of a line that has one endpoint and extends forever in one direction

### rectangle

a quadrilateral with four right angles

### regular polygon

a polygon with all sides congruent and all angles having the same measure

### rhombus

a quadrilateral with four congruent sides

### right angle

an angle with a measure of 90 degrees

### right triangle

a triangle with one right angle in it

### scalene triangle

a triangle with no two sides of equal length

### square

a quadrilateral with four congruent sides and four rigth angles

### square measure

units used to describe the measure of an area in the form of 1 * 1 unit squares

### subproblems

a problem solving strategy which breaks problems into smaller parts which must be solved in order to solve the original problem

### trapezoid

quadrilateral with exactly one pair of parallel sides

### triangle

a polygon with three sides

### vertex

the point at which two rays, line segments or lines meet.

### vertical angles

angles opposite each other when two lines intersect.

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