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How many geometry questions are on the ACT math test?

23

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How many degrees are in a circle?

360

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How many degrees are in a quadrilateral?

360

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Are the diagrams drawn to scale or not to scale?

Usually, the diagrams are drawn to scale.

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The square root of 2 is approximately equal to ...?

1.4

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The square root of 3 is approximately equal to ...?

1.7

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If there is no diagram with a problem, the best thing to do is..?

Draw it yourself.

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How long does a line extend?

A line extends forever in either direction.

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Collinear

When all points are on the same line.

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Line Segment

A line with two endpoints

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Endpoints

The points that stop a line

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How many degrees is the angle of a line?

180

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How many degrees are below a line?

Also 180

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Supplementary Angles

Angles that add up to 180º

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Vertical Angles

Angles opposite from each other and equal to each other

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Perpendicular Lines

When two lines meet so that 90º angles are formed

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Parallel Lines

When two lines in the same plane are drawn so that they extend into infinity without ever meeting

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Triangle

A three-sided figure whose inside angles always add up to 180º

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Isosceles Triangle

A triangle with two equal sides and two equal angles

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Equilateral Triangle

A triangle with three equal sides and three equal angles.

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All three angles of an equilateral triangle are always equal to..?

60º

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Right Triangle

One inside angle is equal to 90º

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Hypotenuse

The longest side of the right triangle (opposite the 90º angle)

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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

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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

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Area of a Triangle

(base x height)/2

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When are triangles similar?

When their angles have the same degree measures; the sides are proportional

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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

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Quadrilateral

A four - sided figure with four angles that add up to 360º

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For any circle problem, four things should be known, which are..?

The radius, the diameter, the area, and the circumference.

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