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Unit 4 (math)
Question | Answer |
---|---|
a part of line that has one endpoint and extends without end in one direction | ray |
a figure formed by two rays or line segments with a common endpoint | angle |
a straight path that goes on forever in opposite directions | line |
lines, line segments, or rays are perpendicular if they form right angles | perpendicular |
the same distance apart at every point | parallel |
lines that are not parallel or perpendicular | oblique |
to cut or divide by passing through or across | intersect |
a tool used to measure angles | protractor |
a unit for measuring angles. also a unit for measuring temperature | degree |
an angle that measures 90 degrees | right angle |
an angle of 180 degrees | straight angle |
angles having a sum of 180 degrees | supplementary angles |
angles having a sum of 90 degrees | complementary angles |
when two lines intersect, the angles formed are these | opposite angles |
pairs of opposite angles formed by intersecting lines | vertical angles |
a closed plane figure with sides made of straight line segments | polygon |
exactly the same size and shape | congruent |
a triangle with at least two congruent sides | isosceles triangle |
having all equal sides | equalateral |
a triangle with no equal sides | scalene triangle |
a triangle with three acute angles | acute triangle |
a triangle with one obtuse angle | obtuse triangle |
a triangle with one right angle | right triangle |
a trapezoid with at leas one right angle | right trapezoid |
a plane figure that forms a closed path so that all the points on the path are the same difference from a point called the center | circle |
an angle greater than 180 degrees | reflex angle |