Number 1

1 given the line g and k are point of P and Q

Draw it :

~ A = Mg [Mh (P) ]

~ B = Mh [Mg(P) ]

~C = Mh [(Mh (P) ]

~D = Mh [Mg (K) ]

~ C = Mh [(Mh (P) ] = P by itself

~ D = Mh [(Mg (K) ] = K

Because at intersection between of the line g and h