Geo

Question 1

sum of 3 sided polygon

Answer 1

180

Question 2

sum of 4 sided polygon

Answer 2

360

Question 3

sum of 5 sided polygon

Answer 3

540

N-2*180

Question 4

sum of 6 sided polygon

Answer 4

720

Question 5

area of trapezoid

Answer 5

(b1+b2)*h/2

Question 6

Triangle - sum of 2 sides must be > or < 3rd side

difference of 2 sides must be > or < 3rd side

Answer 6

>

<

Question 7

right triangles

3 of them

Answer 7

3, 4, 5
8, 15, 17
5, 12, 13

Question 8

measure of exterior angle =

Answer 8

sum of 2 non-adjacent angles

Question 9

inscribed angle

Answer 9

is half of angle that touches center of circle (same arc)

Question 10

area of rhombus

Answer 10

d1*d2/2

Question 11

inscribed triangle has a side that’s the diameter

Answer 11

opposite angle is 90 degrees

Question 12

maximum area

Answer 12

equal sides (square), also gives min perimeter

Question 13

area of equilateral triangle

Answer 13

s^2 rt 3 / 4

Question 14

2 similar triangles with ratio of a:b

Answer 14

area ratio is a^2 : b^2

Applies to any polygon!

Question 15

diagonal of a square

Answer 15

x rt 2

Question 16

diagonal of a cube

Answer 16

x rt 3

Question 17

surface area of a cylinder

Answer 17

2pi r^2 + 2pirh

Question 18

midpoint btwn 2 points (x1,y1) and (x2,y2)

Answer 18

(x1+x)/2, (y1+y2)/2

Question 19

Diagonal of a rectangular volume

Answer 19

D^2=a^2+b^2+c^2

Question 20

Similar triangles

Answer 20

For right angle, just need one other angle bc that proves all 3 angles same so triangles are similar

Either way need to find 2 similar angles

Question 21

Maximize rhombus

Answer 21

Turn into square

Basically turn polygon into right angles to max

Question 22

Perpendicular bi sector

Answer 22

Negative reciprocal slope, don’t forget reciprocal

Question 23

Where parabola touches x axis

Answer 23

Use b^2-4ac

Solve quadratic=0