Geometry: 2D

Question 1

What is the equation for compound interest?

Answer 1

P(1+r/100)^nt

Question 2

What is the equation for total angles in a polygon?

Answer 2

(n-2)180

Question 3

What is the relationships between all sides of a triangle? (Think 2 sides compared to the other remaining side)

Answer 3

One side can not be longer than the combination of the other two

Question 4

For a 45, 45, 90 triangle, what is the relationship between sides?

Answer 4

1:1:sqrt(2)

Question 5

For a 30, 60, 90 triangle what is the relationship between sides?

Answer 5

1:2:sqrt(3)

Question 6

What value is the ratio of circumference “C” to the diameter “d”?

Answer 6

Pi

Question 7

In terms of radius, circumference =?

Answer 7

2pi*r

Question 8

What is the equation to find length of arc?

Answer 8

length of arc / circumference = degree measure of arc / 360

Question 9

Area of a circle?

Answer 9

pi*r^2

Question 10

Area of a sector (think slice of pizza!)?

Answer 10

area of sector / area of circle = angle of sector / 360

Question 11

If one side of an inscribed triangle is the diameter what type of triangle is it, and which angle is the the angle of note?

Answer 11

Right triangle and 90 degrees is across from diameter

Question 12

What is arc?

Answer 12

section of circumference

Question 13

What is a chord?

Answer 13

Line that goes through a circle (could be diameter!)

Question 14

What is the area of an equilateral triangle?`

Answer 14

sqrt(3)/4 * side length^2