Answer:
254.44cm²
Step-by-step explanation:
For the triangles do pythagoras theorem:
a²+b²=c²
c=hyptonuse=8.8
b=6.2
so we don't know what a is.
We rearrange a²+b²=c² to get a²=c²-b²
8.8²=77.44
6.2²=38.44
77.44-38.44=39
square root of 39 is 6.2(1 d.p)
a=6.2
6.2x6.2=38.44cm²
6.2x7.2=44.64cm²x2=89.28cm²
8.8x7.2=63.36cm²x2=126.72cm²
126.72+89.28+38.44=254.44cm²
