s =1/2(a+b)*h
128=1/2(13+3)*h
128=8*h
h=128:8
h=16
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s =1/2(a+b)*h
128=1/2(13+3)*h
128=8*h
h=128:8
h=16
Verified answer
S=(a+b):2*h. 128=(13+3)*h. h=16