$\"\"$

The height of the trapezoid is h, bases are 15 cm and 20 cm and area is 140 c $\"\"$ .

Area of a trapezoid is $\"\"$

$\"\"$ (Substitute 15 for $\"\"$ , 20 for $\"\"$ and 140 for A)

$\"\"$ (Add: $\"\"$ )

$\"\"$ (Divide: $\"\"$ ) $\"\"$

$\"\"$ (Divide each side by 17.5)

$\"\"$ (Cancel common terms)

$\"\"$ (Divide: $\"\"$ ) $\"\"$

The height of the trapezoid is $\"\"$ .