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32) BD² = BC² + CD²
BD² = 15² + 8²
BD² = 225 + 64
BD² = 289
BD = √289
BD = 17 cm

LΔ = 1/2 x a x t
LΔ = 1/2 x 8 x 15
LΔ = 60 cm²

L layang² = 2 x LΔ
L layang² = 2 x 60
L layang² = 120 cm² (c)

33) K = 4s
K = 4.20
K = 80 cm (c)