Question

can anyone answer question number 11 and 12

Answer 1

11) distance between observe C and vertical cliff is 40m
for observe A
tan48=height of cliff from ground to A /40m
height of cliff from ground to A =40tan48 m
for observe B
tan57 =height of cliff from A +distance between A and B/40m
distance between A and B =40tan57-40tan48
=40 (tan57-tan48) m

12) let height of pole =h
man's height=x
tan28=(h-x)/9
h-x=9tan28 -----(1)
tan13=x/9
x=9tan13 ------(2)
hence from equation (1) and (2)
h=9 (tan28+tan13)