geometrie Flashcards by Angela Cojoc

Q

teorema sinusului

A

a/cosA=b/cosB=c/cosC=2R

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Q

teorema cosinusului

A

a^2=b^2+c^2+2bc*cosA

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Q

Aria triunghiului dreptunghic

A

c*c/2

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Q

aria triunghiului oarecare

A

bh/2=abc/4R=absinC/2=rp=rad(p(p-a)(p-b)(p-c))

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Q

aria triunghi echilateral

A

l^3rad3/4

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Q

distanta dintre doua puncte

A

rad(xb-xa)^2+(yb-ya)^2

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Q

panta unei drepte

A

yb-ya/xb-xa

-a/b

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Q

ecuatia dreptei care trece prin doua puncte

A

y-ya/yb-ya=x-xa/xb-xa

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