leopard7982
20.04.2020 •
Mathematics
I would appreciate it if you help me pls asap !!
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Ответ:
BC= 20 units
Step-by-step explanation:
Since ∆ ABC is an equilateral triangle, all the sides are equal in length.
AC= BC
=>-y+23= 6y+2
=>-y-6y= 2-23
=>-7y= -21
=>y= 21/7
=>y= 3
BC = 6y+2 = 6(3)+2 = 18+2 = 20 units
Ответ:
height (h) = 6m
270π m² or 848.23m²
Step-by-step solution:
A = 2πhr + 2πr²
• Substitute variables into formula
-> A = 2π(6)(9) + 2π(9)²
• Solve
-> A = 2π(54) + 2π(81)
-> A = 108π + 162π
-> A = 270π
-> A = 848.23