Luas sebuah jaring 40 cm jika jari jarinya 10 cm berapakah panjang busur jaring?.... Question from @yhasiryr

September 2018 2 29 Report

Luas sebuah jaring 40 cm jika jari jarinya 10 cm berapakah panjang busur jaring?

zpretycia D =?

40 : 10 = 4 x 4 = 16 cm

0 votes Thanks 1

ekamiaww $luas\ juring= \frac{ \alpha }{360}. \pi r^2 \\ 40= \frac{ \alpha }{360}. \pi 10^.10 \\ 40= \frac{ \alpha }{360} .100 \pi \\ \alpha = \frac{360.40}{100 \pi } \\ \alpha = \frac{144}{ \pi } \\ \\ panjang\ busur= \frac{ \alpha }{360} .2 \pi r \\ = \frac{ \frac{144}{ \pi } }{360} .2. \pi .10 \\ = \frac{144}{ \pi } . \frac{1}{360} .20 \pi \\ =0,8\ cm$

semoga membantu ya :)

0 votes Thanks 1

yhasiryr jdi pnjng busur nya 0,8 cm?

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