Need in this question about surface area

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

which expression can be used to convert 80 us dollars (usd) to australian dollars (aud)?

1 usd = 1.0343 aud

1 aud = 0.9668 usd

step-by-step explanation:

sorry just need the points