Danny and Carly like to work on jigsaw puzzles. Danny has two puzzles. If together they have 9 puzzles, then we can use the equa
2 answers:
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Answer:
D. 420
The area of a triangle is
half of(base× height)
10×16= 160
160÷2=80
That is the surface area of ONE triangle.
multiply 80 by 4 to get 320
then find the surface area of the square by doing length×width to get 100
Finally add them together
320+100=420
