Answer:
-3
Step-by-step explanation:

Answer:
<h2>The answer is 15cm</h2>
Step-by-step explanation:
Let b be the length of the second parallel side
Area of a trapezium is given by

where
h is the height
a and b are the parallel sides
From the question
Area = 230 cm²
height = 20cm
one of parallel side / a = 8 cm
Substitute the values into the above formula and solve for b
That's

Reduce the fraction with 2
That's

Expand the terms
That's


Divide both sides by 10
We have the final answer as
<h3>b = 15cm</h3>
Hope this helps you
Answer:
1 1/2 or 1.5
Step-by-step explanation:
trapezoid area formula: a = (a+b/2) x h
bases: 8 + 4 = 12
12/2=6
6 x 1/4 = 1.5 or 1 1/2