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B
/|
/ |
/ | ↑
/ | 4250 ft
/ | ↓
A / 82^{0} | C

BC / AC = tan 82^{0} ---> AC = BC / tan 82^{0}
B AC ≈ 4250 ÷ 7.11537 = 597.3 ft
|\
| \
| \ 13 ft
| \ | 12 ft \ A
C

a^{2} + b^{2} = c^{2} ---> a^{2} = 13^{2} - 12^{2} = 25 ---> a =
5 ft OR
cos A = AB / AC
cos A = 12 / 13 = 0.923077
measure of angel A = 22.62^{0}
sin 22.62^{0} = BC / AB ---> BC = AB * sin 22.62^{0} ---> BC = 13 * 0.3846 =
5 ft