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blagie [28]
3 years ago
13

Can someone answer this for me please

Mathematics
1 answer:
Citrus2011 [14]3 years ago
5 0
The perimeter is the total measurement of all the sides together. 
P = 82
Perimeter is side + side + side and so on.
So here is what we have.
15.4 + 16.2 + 28.7 + d = 82
Add up what you have now
60.3 + d = 82
Subtract 60.3 from both sides to get D
d = 82 - 60.3
d = 21.7
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