Q. Find the area,in square metres,of the trapezium whose bases and altitude area as under:
(i) bases=12 dm and 20 dm,altitude=10 dm
(ii) bases=28 cm and 3 dm,altitude=25 cm
(iii) bases=8 m and 60 dm,altitude=40 dm
(iv) bases=150 cm and 30 dm,altitude=9 dm