Math Review

Question 1

Area of a triangle

Answer 1

1/2bh

Question 2

Pythagorean theorem

Answer 2

a² + b² = c²

Question 3

Three Pythagorean triples

Answer 3

3: 4:5
5: 12:13
7: 24:25

Question 4

Special triangles: 45/45/90

Answer 4

x, x, x√2

Question 5

Special triangles: 90/30/60

Answer 5

x, x√3, 2x

Question 6

If two sides of a triangle are x and y, what must the third side be?

Answer 6

Less than x + y

Greater than |x + y|

Question 7

Area of a parallelogram

Answer 7

bh

Question 8

Area of a circle

Answer 8

πr²

Question 9

Circumference of a circle

Answer 9

2πr

Question 10

Single digit prime numbers

Answer 10

2
3
5
7

Question 11

Formula for percent change

Answer 11

Change / original • 100

Question 12

Formula for probability:
p = probability for success
n = number of tries

Answer 12

1-(1-P)^N

Question 13

Common quadratic:

(x + y)²

Answer 13

x² + 2xy + y²

Question 14

Common quadratic:

(x - y)²

Answer 14

x² - 2xy + y²

Question 15

Common quadratic:

x + y)(x - y

Answer 15

x² - y²

Question 16

13²

Answer 16

169

Question 17

Surface area of rectangular solid

Answer 17

2lw + 2wh + 2lh

Question 18

Group formula

Answer 18

Total = Group 1 + Group 2 - Both + Neither

Question 19

Standard deviation percents

Answer 19

2
14
34
Mean
34
14
2

Question 20

True or false: in combination questions, if order DOESN’T matter, divide by the factorial.

Answer 20

True