The Basics (Leaving Cert Mathematics): Flashcards

All angles are $60°$

Two equal sides; angles opposite these sides are equal

All sides and angles are different

All angles less than $90°$

One angle greater than $90°$

Side opposite the $90°$ angle

$180°$

Sum of two non-adjacent interior angles

Sum of any two sides $>$ third side

$c^2 = a^2 + b^2$ (c is hypotenuse)

Intersection of medians; divides them in $2:1$ ratio

Intersection of altitudes

Intersection of perpendicular bisectors; center of circle through all vertices

Intersection of angle bisectors; center of inscribed circle