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30 terms

ACT Ch13

Geometry
STUDY
PLAY
How many geometry questions are on the ACT math test?
23
How many degrees are in a circle?
360
How many degrees are in a quadrilateral?
360
Are the diagrams drawn to scale or not to scale?
Usually, the diagrams are drawn to scale.
The square root of 2 is approximately equal to ...?
1.4
The square root of 3 is approximately equal to ...?
1.7
If there is no diagram with a problem, the best thing to do is..?
Draw it yourself.
How long does a line extend?
A line extends forever in either direction.
Collinear
When all points are on the same line.
Line Segment
A line with two endpoints
Endpoints
The points that stop a line
How many degrees is the angle of a line?
180
How many degrees are below a line?
Also 180
Supplementary Angles
Angles that add up to 180º
Vertical Angles
Angles opposite from each other and equal to each other
Perpendicular Lines
When two lines meet so that 90º angles are formed
Parallel Lines
When two lines in the same plane are drawn so that they extend into infinity without ever meeting
Triangle
A three-sided figure whose inside angles always add up to 180º
Isosceles Triangle
A triangle with two equal sides and two equal angles
Equilateral Triangle
A triangle with three equal sides and three equal angles.
All three angles of an equilateral triangle are always equal to..?
60º
Right Triangle
One inside angle is equal to 90º
Hypotenuse
The longest side of the right triangle (opposite the 90º angle)
Isosceles Right Triangle
The sides and angles are always in a particular proportion. The angles are 45º, 45º, 90º and the hypotenuse includes a square root of 2
30-60-90 Right Triangle
Always has the same proportion. The hypotenuse is twice as large and the medium side is equal to the short side times the square root of 3
Area of a Triangle
(base x height)/2
When are triangles similar?
When their angles have the same degree measures; the sides are proportional
Third Side Rule
States that it is impossible for the third side of a triangle to be longer than the total of the other two sides
Quadrilateral
A four - sided figure with four angles that add up to 360º
For any circle problem, four things should be known, which are..?
The radius, the diameter, the area, and the circumference.