Distance, Midpoint, Perimeter

Formulas

200

What’s the formula for distance? 

(x1-x2)2+(y2-y1)2= d 

300

What’s the formula for midpoint? 

x1+x2/2 

y1+y2/2 

400

What’s the formula for perimeter? 

a2+b2=c2 

And 

c=2(3.14)r

how to write

100

Answer for distance ? 

^number = d

~~ number units 

200

Answer for midpoint? 

(Number, number) coordinate pair 

300

Answer for perimeter? 

Perimeter = number + ^number ~~ number units 

how to find

100

Distance 

Label the numbers x1, y1, x2, y2 

Square them 

Add them 

^answer, ~~answer units 

200

Midpoint 

Label numbers x1,y1,x2,y2 

Add them 

And divide them 

Write as a coordinate pair 

300

Perimeter 

Make a triangle, go down and over 

Preform a2+b2=c2 

Write it as ^number = c 

Perimeter = ^number + number ~~ number units 

400

Circle 

Find diameter 

Cut in half 

Plug into c= 2(3.14) r 

Multiply numbers 

Perimeter = number (3.14) ~~ number units  

500

Semicircle 

Make a triangle 

Preform a2+b2=c2 

Number = c 

Plug into c = 2 (3.14) r 

Multiply numbers 

Number (3.14) divide in half but not 3.14 

Write as number (3.14) + number ~~ number units