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Circle Area

pie r squared

Circle Circumference

2 pie r or pie times diameter

rectangle area

length times width

rectangle perimeter

2 times length plus 2 times width

triangle area

1/2 base times height

line equations

y=mx+b

slope

m=y2-y1/x2-x1

sin

opp/hypotenuse

cos

adja/hypot

tan

opp/adja

complementary

90

supplementary

180

pythagorean therom

a2 + b2= c2