Lines
Two lines that are the same distance apart and will never touch
Parallel lines
The name of a 90o angle
A right angle
A triangle with the same length sides
Equilateral triangle
The number of sides on a quadrilateral
Four
The name of a 6 sided figure
A hexagon
Lines that intersect to form a right angle
Perpendicular
An angle that is less than 90 degrees
Acute angle
A triangle with two sides the same length
Isosceles triangle
Total number of degrees all angles of a quadrilateral
360o
The name of a 5 sided figure
A pentagon
Has one endpoint and continues in one direction forever
A ray
An angle greater than 90o
Obtuse angle
A triangle with one angle greater than 90o
An obtuse triangle
A quadrilateral with two sets of parallel sides and 4 right angles
A rectangle
A right triangle has one angle that is 45o. What is the measure of the 3rd angle?
45o
Part of a line
A line segment
The number of degrees in a straight angle
180o
A triangle with a 90o angle AND no sides the same length
A right, scalene triangle
A quadrilateral with two sets of opposite, parallel, congruent sides, not necessarily with right angles
A rhombus
A quadrilateral has 3 angles measuring 90o, 100o, and 70o. What is the measure of the 4th angle?
100o
Any closed figure with at least 3 sides
A polygon
The tool used to measure angles
A protractor
Total value of all angles in every triangle
180o
A quadrilateral with only one pair of opposite, parallel sides
A trapezoid
A boat has a sail with one pair of perpendicular lines, and two sides the same length. What kind of triangle is it?
Right Isosceles