Geometry Flashcards

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1
Q

Pythagorean Triplets

A

{3, 4, 5}
{5, 12, 13}
{8, 15, 17}
{7, 24, 25}

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2
Q

Hypotenuse of an Isosceles (45°-45°-90°) Right Triangle

A

Hypotenuse = √2*(leg)

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3
Q

30°-60°-90° triangle hypotenuse?

A

hypotenuse = 2 * (short leg)

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4
Q

30°-60°-90° triangle long leg?

A

long leg = √3 * (short leg)

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5
Q

Area of equilateral triangle?

A

Area of equilateral triangle = (S^2√3)/4

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6
Q

Parallelogram properties?

A

1) parallel opposite sides
2) equal opposite sides
3) equal opposite angles
4) diagonals bisect each other

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7
Q

Rhombus properties?

A

1) the big four of parallelogram properties
2) all four sides are equal
3) Diagonals are perpendicular

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8
Q

Rectangle properties?

A

1) the big four of parallelogram properties
2) four angles equal to 90
3) Diagonals are congruent

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9
Q

Sum of angles in an n-sided polygon

A

(n - 2) * 180°

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10
Q

relationship btw diameter d and radii r

A

diameter d = 2r (radii)

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11
Q

circumference of a circle?

A

c = πd or c = 2πr

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12
Q

Area of a circle?

A

A = πr^2

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13
Q

area of sector proportion

A

area of sector/area of circle = angle/360

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13
Q

Arclength proportion

A

arclength/circumference = angle/360

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