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GMAT > Geometry Memorization List > Flashcards

Geometry Memorization List Flashcards

1
Q

Sum of Interior Angles for Triangle

A

180

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2
Q

Sum of Interior Angles for Quadrilateral

A

360

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3
Q

Sum of Interior Angles for Pentagon

A

540

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4
Q

Sum of Interior Angles for Hexagon

A

720

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5
Q

Equation to Find Degrees of Polygon with N Sides

A

(n-2) x 180

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6
Q

Area of a Triangle

A

1/2BH

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7
Q

Area of Rectangle

A

Length x Width

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8
Q

Area of Trapezoid

A

1/2(Base1 + Base2) x Height

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9
Q

Hypotenuse of Right Triangle with Pythagorean Theorem

A

a2 + b2 = c2

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10
Q

Diagonal of a Rectangular Solid with Deluxe Pythagorean Theorem

A

a2 + b2 + c2 = d2

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11
Q

Common Right Triangles

A

3-4-5; Key Multiples:6-8-10, 9-12-15, 12-16-20

5-12-13; Key Multiples: 10-24-26

8-5-17 (no key multiples)

45-45-90 Triangles: a-a-a√2; a2 +a2 = (a√2) 2 = 2a2

30-60-90 Triangles: a-a√3-2a; a2 +(a√3)2 =(2a) 2 = 4a2

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12
Q

Area of a Circle

A

πr2

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13
Q

Volume of Cylinder

A

πr2h

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14
Q

Diameter of a Circle

A

2r

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15
Q

Circumference of a Circle

A

2πr = πd

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16
Q

If one of the sides of an inscribed Triangle is a diameter of the circle (in which the triangle is inscribed)…

A

then the triangle must be a right triangle.

17
Q

The exterior angle of a triangle is equal in measure to the…

A

the sum of the two non-adjacent

(opposite) interior angles of the triangle

18
Q

If parallel lines are cut by a transversal…

A

, then all the acute angles that are formed will be equal,

so too will all the obtuse angles be equal.

19
Q

Isosceles triangles have…

A

have both two sides that are equal and two angles that are equal

20
Q

The slope intercept form of a line is…

A

y=mx + b (where m is the slope and b is the y-intercept).

21
Q

You can calculate the slope intercept form of a line with…

A

just two points.

GMAT (2 decks)

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