Cyclic Quadrilateral
- A pair of opposite angles of cyclic quadrilateral are suppl
For two points $A(x_1,y_1)$ and $B(x_2,y_2)$, the distanc… Read
For a circle $\mathscr{C}$ with centre $(h,k
For a straight line $\ell$ with slope $m$ an
Angle sum of $n$-gon $=(n-2)\times180
For two points $A(x_1,y_1)$ and $B(x_2,y_2)$, the coordin… Read
Result: $a=b$
Reference: corr. $\an
For two straight lines $\ell_1$ and $\ell_2$ with