Question

find the perimeter and area of quadrilateral ABCD in which AB=9cm,AD=12cm,BD=15cm,CD=17cm and angle CBD= 90°

Answer 1

17*17=15*15+bc*bc
289=225+bc*bc
64=bc*bc
8=bc
perimeter=17+12+9+8
perimeter=46cm
area1 =1/2*8*17=68cm2
area 2=1/2*12*9=54cm2
total area =122cm2