Answer:
Use formula
area of trapezium=(a+b)/2×h
Step-by-step explanation:
1)
area of trapezium=(a+b)2×j
as this u can calculate all of yr areas.
6ac+10ac
2ac(6ac+10ac)
2ac(3+5)
(8,12)
1) 6.438km 2)818,700m 3)6750cm