Jawabanmu

2014-06-16T20:03:25+07:00
Tembereng =  \frac{90}{360} x k lingkarang
 \frac{90}{360} x 3,14 x 10 cm
= \frac{90}{360} x 31,4
= 1/4 x 31,4
= 7,85 cm

maaf kalo salah
2014-06-16T20:30:34+07:00
Luas tembereng = 90/360 × K.lingkaran
90/360 × 3,14 × 10
1/4 × 31,4
7,85 cm