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157 = 3.14 x r x 10
157 = 31.4r
r = 157/31.4
r = 5
s² = r² + t²
10² = 5² + t²
100 = 25 + t²
t² = 100 - 25
t² = 75
t = √ 75
t = 8.66 cm
# maaf kalau salah
πrs =luas selimut kerucut
3,14.r.10 = 157
31,4.r =157
r =157/31,4 =5
penyelesaian
t²=s²–r²
t=√s²–r²
t=√10²–5²
t=√100–25
t=√75=8.66