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1. tt(tinggi tiang) 6m tp(tinggi pohon) 4m bp(bayangan pohon) 8m
tt/bt = tp/bp
6/bt = 4/8
bt×4 = 6×8
bt = 48:4 = 12cm
2. luas selimut = 4cm t = 10cm π 22/7
volume = πr²t r?
luas selimut = 2πrt
2πrt = luas selimut
2×22/7×r×10 = 4
440/7×r = 4
r = 4/440/7 = 4×7/440 = 7/10 = 0,7
volume πr²t
22/7×0,7×0,7×10
107,8/7 (sama sama dikali 10 buat menghilangkan koma) 1078/70 = 15,4cm³