angle and triangle flash cards you need 15 index cards for this!
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Angle and Triangle Flash Cards
You need 15 index cards for this!
Angle
A
B C
Two rays with a common endpoint called a vertex.
Always name an angle with the vertex in the middle.
Adjacent Angles
Angles that share a vertex and a side.
Congruent Angles
64° 64° Y X
Angles with the same measure.
Vertical Angles
Angles formed by intersecting lines and are opposite each
other.
Vertical angles are always congruent!
Acute Angles
The measure of the angle is less than 90°.
Obtuse Angles
The measure of the angle is greater
than 90° and less than 180°.
Right Angles
The measure of the angle is 90°.
Complementary Angles
The sum of the two angles is 90°.
Supplementary Angles
The sum of the two angles is 180°.
SCALENE TRIANGLE
All three sides have different lengths:
ISOSCELES TRIANGLE
Has at least 2 congruent sides
EQUILATERAL TRIANGLE
All three sides are congruent
ACUTE TRIANGLE
All of the angles are acute
(less than 90°)
OBTUSE TRIANGLE
One obtuse angle
(greater than 90 less than 180)
RIGHT TRIANGLE
Has one right angle (90°)