geometry formulas

Question 1

total angle sum of a triangle

Answer 1

180

Question 2

total sum if a 4 sided figure (4 angles)

Answer 2

360

Question 3

total degrees in a circle

Answer 3

360

Question 4

triangle length rules

Answer 4

the length of any side must be less than the sum of the others AND greater than the difference between 2 sides (less or greater, NOT equal to)

Question 5

area of a triangle

Answer 5

(1/2) bh

Question 6

Pythagorean theorem only applies to what kind of triangles

Answer 6

Right triangles

Question 7

Length of a diagonal of a square

Answer 7

one side of the square times sqrt(2)

Question 8

Right isosceles triangle sides

Answer 8

x, x, xsqrt(2)

Question 9

The long side of a 30,60,90 RIGHT triangle

Answer 9

short side x sqrt(3)

Question 10

circumference of a circle

Answer 10

2pi(r) or pi(d)

Question 11

area of a circle

Answer 11

pi(r)2

Question 12

how to find the diameter of a circle inside a square

Answer 12

the diameter= length of a side of a square

Question 13

points (x,5) (-6y)

x=6, y=6

Answer 13

(:

Question 14

slope formula

Answer 14

change in y/change in x

y2-y1 / x2-x1

Question 15

Solving for x with a linear equation

Answer 15

set y to 0, 0=mx+b

Question 16

perpendicular lines have slopes that are

Answer 16

negative reciprocals of eachother

Question 17

parallel lines have slopes that are

Answer 17

the same

Question 18

volume of a circular cylinder

Answer 18

pi(r)2(h)

area x height

Question 19

surface area formula

Answer 19

sum of the areas of its sides

Question 20

arc length of a circle

Answer 20

x/360 (2pi r)

x being the measure of the angle for the arc youre finding the length of