_ _ _ _ _
A= 1/2 * 12 * ( 14 + 9
) =
138 cm2
_ _ _ _ _
A= 1/2 * 10 * ( 20 + 6) = 130 cm2
_ _ _ _ _
A= 1/2 * 8 * ( 10 + 12 ) = 88 in2
_ _ _ _ _
A= 1/2 * 5 * ( 10 + 14 ) = 60 in2
_ _ _ _ _
A= 1/2 * 9 * ( 10 + 18 ) = 126 m2
_ _ _ _ _
A= 52 = 1/2 * H * ( 11 + 15 )
H = 4