treway3982
27.08.2019 •
Mathematics
John is trying to determine the length of the staircase he will need for a deck that is 12 feet high he wants to start the stairs 21 feet from the deck
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Ответ:
legs are 21 and 12
a^2+b^2=c^2
12^2+21^2=c^2
144+441=c^2
585=c^2
sqrt both sides
5√65=c
aprox
24.1868=c
about 24.2 feet
Ответ:
144 cm²
Step-by-step explanation:
2(½×6×8) + (4×8) + (4×10) + (6×4)
= 144 cm²