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# Geometry Unit

### Angles, Triangles

TermDefinition
intersecting lines lines that cross at a point
vertical angles angles which are formed by intersecting lines and have equal measures
adjacent angles angles that are next to each other
supplementary angles angles whose measures have a sum of 180 degrees
complementary angles angles whose measures have a sum of 90 degrees
acute angle has a measure less than 90 degrees
obtuse angle has a measure more than 90 degrees, but less than 180 degrees
right angle has a measure of exactly 90 degrees
acute triangle a three sided shape with all angles measuring less than 90 degrees
right triangle a three sided shape with one angle measuring exactly 90 degrees
obtuse triangle a three sided shape with one angle measuring greater than 90 degrees
isosceles triangle a three sided shape with two congruent sides
equilateral triangle a three sided shape with all congruent sides
scalene triangle a three sided shape with all sides measuring different lengths
triangle inequality theorem Helps us to know if three sides will form a triangle. The sum of the two smaller sides, must be greater than the largest side.
No, 2 + 5 needs to be greater than the third side. Will sides of 2, 5, and 7 form a triangle?
No, 4 + 10 needs to be greater than the third side. Will sides of 4, 15, and 10 form a triangle?
Yes, 4 + 5 is greater than the third side. Will sides of 4, 5, and 6 form a triangle?
2<x<10 If two sides of a triangle are 6 and 4, give the range of values for the third side.
180 degrees What is the sum of all the measures of the angles of a triangle?
congruent having exactly the same shape, size or measure
5<x<11 If two sides of a triangle are 8 and 3, give the range of values for the third side.
15<x<55 If two sides of a triangle are 20 and 35, give the range of values for the third side.
Created by: braggk