Answer:
Explanation:
area of field=1/2(a+b)h
a=12
b=20
h=?
h=pythagoras theorem
a²+b²=c²
a²+8²=17²
a²+64=289
a²=289-64
a²=221
a=√221
a=14.9
area of field=1/2(12+20)14.9
area=238.4m²
£19.75×3=£59.25
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