Tolong dijawab no 3-7 dengan caranya

3)AB/CD X AD/DC
25/CD X 4/11

4CD=25 X 11
4CD = 275
CD= 275/4
CD=68,75

4)L^=P^-(R-r)^
l= 10^-(8-7)^
l= 100-1
l=99
l=√99

5)AB=P^- (R-r)
AB=34^- (10-6)^
AB=1156-4^
AB=1156-16
AB=1140

7)D=2X10 =20 CM
3d + p(yg simbol itu) x d
3 x 20 + 22 per 7 x 20
60+62,8
=122,8