Math Flashcards

(16 cards)

1
Q

Total degrees of a polygon where n = # of sides

A

180(n-2)

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2
Q

Average degrees per side or degree measure of congruent polygon

A

180* ( (n-2)/n )

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3
Q

Area of triangle

A

1/2 * b * h

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4
Q

An isosceles right triangle (45-45-90) has sides in a ratio of

A

x * x * x sqrt(2)

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5
Q

A 30-60-90 triangle has sides in a ratio of

A

x * x sqrt(3) * 2x

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6
Q

Sets of numbers for each side of certain right triangles:

A

3-4-5

5-12-13

8-15-17

7-24-25

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7
Q

Basic triangle side rule

A

兩邊之和大於第三邊

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8
Q

Arc length

A

x/360 * 2πr

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9
Q

Area of sector

A

x/360 * πr^2

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10
Q

Formula of a line

A

y=mx+b

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11
Q

Formula of slope

A

m=(y1-y2)/(x1-x2)

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12
Q

The slope of two lines which are perpendicular to each other, if one slope is x, what is the slope of the other line?

A

-1/x

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13
Q

The distance formula

A

Sqrt( (x2-x1)^2 + (y2-y1)^2 )

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14
Q

Formula of sequence: 1+2+3+…+n is

A

n(n+1)/2

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15
Q

If 27/4 has reminder 3 and 6/4 has reminder 2 what’s the reminder of (27+6)/4?

A

R1+R2 = 3+2 -4 =1

Because 3+2 is 5 which is larger than the divisor 4, hence we subtract the sum by divisor!

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16
Q

What is the reminder of 2/11

A

2

Every fraction that the numerator is greater than the denominator, the reminder is the numerator