Answer: 16 cm
The length of the other parallel side = 16 cm
Explanation:
Area of trapezium = 1/2 (sum of two || sides) × height
Given the area of a trapezium is 660 cm² and the length of one of the parallel sides is 28 cm.
its height is 30 cm
Let us assume the length of the other parallel side is 'x' cm.
Plugging the required values in the above formula,
660 = 1/2 (28 + x) 30
solving the equation for x,
660 = (28 + x ) 15
Divide both sides by 15,
660/15 = (28 + x)
44 = (28 + x)
Subtract 28 from both sides,
44 - 28 = x
16 = x
x = 16 cm
Hence, the length of the other parallel side is 16 cm