Geometry

1) In the diagram below, if $AD=30$, what is $BC$? [asy] size(5cm); pair A,B,C,D; B=(0,0); A=(0,8); C=(12,0); D=(12,-2); draw(A–B–C–D–A); draw(rightanglemark(C,B,A,20)); draw(rightanglemark(D,C,B,20)); label(“$A$”,A,NW); label(“$B$”,B,SW); label(“$C$”,C,NE); label(“$D$”,D,SE); label(“$11$”,A–B,W); label(“$4$”,C–D,E); [/asy] 2) If Continue Reading →