Math

Question 1

Total degrees of a polygon where n = # of sides

Answer 1

180(n-2)

Question 2

Average degrees per side or degree measure of congruent polygon

Answer 2

180* ( (n-2)/n )

Question 3

Area of triangle

Answer 3

1/2 * b * h

Question 4

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

Answer 4

x * x * x sqrt(2)

Question 5

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

Answer 5

x * x sqrt(3) * 2x

Question 6

Sets of numbers for each side of certain right triangles:

Answer 6

3-4-5

5-12-13

8-15-17

7-24-25

Question 7

Basic triangle side rule

Answer 7

兩邊之和大於第三邊

Question 8

Arc length

Answer 8

x/360 * 2πr

Question 9

Area of sector

Answer 9

x/360 * πr^2

Question 10

Formula of a line

Answer 10

y=mx+b

Question 11

Formula of slope

Answer 11

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

Question 12

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

Answer 12

-1/x

Question 13

The distance formula

Answer 13

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

Question 14

Formula of sequence: 1+2+3+…+n is

Answer 14

n(n+1)/2

Question 15

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

Answer 15

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!

Question 16

What is the reminder of 2/11

Answer 16

2

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