Geometry Flashcards

0
Q

Vertex of an angle

A

The point of intersection

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1
Q

Parallel

A

Two lines are parallel if they lie in the same plane and never intersect each other

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2
Q

Acute angle

A

Angle whose degree measure is between 0 and 90 degrees

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3
Q

Right angle

A

Is exactly 90 degrees

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4
Q

Obtuse angle

A

Angle whose degree measure is between 90 and 180

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5
Q

Straight angle

A

Exactly 180 degrees

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6
Q

Perpendicular

A

Two lines are perpendicular if they intersect at a 90 degree angle.

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7
Q

Supplementary angles

A

Two angles are supplementary if the sum of their measures is 180

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8
Q

Complementary

A

Two angles are complementary if the sum of their measures is 90

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9
Q

Bisect an angle

A

A line or line segment bisects an angle if it splits the angle into two smaller, equal angles

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11
Q

Vertical angles

A

Pair of opposite angles formed by two intersecting line segments.

At the point of intersection two pairs of vertical angles are formed.

The two angles in a pair have the same degree measure.

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12
Q

Exterior Angle Theorem

A

The exterior angle of a triangle is equal to the sum of the two remote (nonadjacent) interior angles of the triangle.

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13
Q

What to do with a 75-60-45 triangle

A

Split into two right triangles by splitting the 75 degree angle. This will create one 45-45-90 triangle and one 30-60-90 triangle.

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14
Q

Are two triangles congruent?

A

If one of the following applies:

  • the three sides are all congruent to the other triangle
  • if two sides and the included angle are congruent to another
  • if two angles and the included side are congruent to the other.
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15
Q

Tangent lines

A

If a line is tangent to a circle (intersects it at exactly one point), then a radius drawn from the center of the circle to the point of tangency is perpendicular to the line.

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16
Q

Triangle inscribed in a circle

A

If one side of the triangle is the diameter of the circle, then the triangle is a right triangle.
Conversely, if a right triangle is inscribed in a circle, then one of its sides is the diameter.

17
Q

Rectangular solids

A

6 faces, 12 edges, 8 vertices