% This figure was an illustration for an exercice about
% the sum of the angles "alpha" and "beta".
% Copyright (c) Christian Obrecht 2001

frame(-1,-.7,7.5,3.5)

A X Y right(7,3); A B C right(5,2)

draw(segment(A,X))
draw(segment(A,Y))
draw(segment(B,C))

draw("25",segment(A,B),-90:)
draw("10",segment(A,C),180:)
draw("$\alpha$",C,.7,35:)
draw("$\beta$",B,.7,90:)

color(gray)
mark(B,A,C,right) ; mark(X,B,C); mark(B,C,Y)