HavenShort3075
18.03.2021 •
Mathematics
Mary buys a 10-meter spool of thread for sewing. She uses 210 centimeters. How much is left on the spool in centimeters?
A. 21 cm
B. 190 cm
C. 790 cm
D. 2100 cm
Solved
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Ответ:
Just need to put zero instead of y and solve the equation for find the value of x :
0 = 2 Cot ( x/4 )
Cot ( x/4 ) = 0
Cot ( x/4 ) = Cot ( π / 2 )
x / 4 = π / 2
x = 4 × π / 2
x = 2π
Thus the correct option is C .