Explanation:
lets first find area of trapezium
1/2 x (a+b)x h
1/2 x (8x10) x6 (10 because 6 plus 4)
1/2 x 80 x 6
1/2 x 480
240 cm square is area of trapezium
now to find area of triangle
1/2x b x h
1/2 x 6 x 6
1/2x 36
18cm square
now if u want area of shaded part
trapezium minus triangle
240 minus 18
222cm square