Final answer:
To find the area of a trapezium, you can use the formula: Area = (sum of the lengths of the parallel sides) x (height) / 2. In this case, the lengths of the parallel sides are 20 cm and 15 cm, and the height is 12 cm. Therefore, the area of the trapezium is 420 cm^2.
Step-by-step explanation:
To find the area of a trapezium, we can use the formula:
Area = (sum of the lengths of the parallel sides) x (height) / 2
In this case, the lengths of the parallel sides are 20 cm and 15 cm, and the height is 12 cm.
Therefore, the area of the trapezium is:
Area = (20 cm + 15 cm) x 12 cm / 2
Area = 35 cm x 12 cm / 2
Area = 420 cm2