...2857142857142857143x7=?
Quadrangles - what is the taxonomy:
Kites (pairs of neighboring sides equal) - Parallelograms (opposite sides <=> opposite angles are equal)-Trapezoids (pairs of neighboring angles are equal)
Rhombi (=diamonds) Rectangles
Squares
Midsides operations: take midpoint of all 4 sides of a quadrangle Q, get another quadrangle M(Q).
Turns out, - M(Q) is always a parallelogram!
Q-rhombus <=> M(Q) - rectangle, and vice versa.
Logics:
Two villages (Knights and Knaves), a person at the fork - which road goes to Knights village?
Larry, Leon, Tom, L's are liars, Tom tells truth. How to find if you speak to Larry?
When the angle between the hands is wider: 5 past 11, or 10 past noon?
$x^2 $
$x^2 $
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