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L persegi = s² = 30² = 900 m²
L kolam = p x l = 12 x 9 = 108 m²
L yang tidak dibangun kolam = 900-108 = 792 m²
NOMOR 27
Lp = ( 2 x p x l ) + ( 2 x p x t ) + ( 2 x l x t )
= (2 x 36 x 18 ) + ( 2 x 36 x 20 ) + ( 2 x 18 x 20 )
= 1.296 + 1.440 + 720
= 3.456 cm²
NOMOR 28
V = π x r² x t
= 22/7 x 3,5² x 14
= 539 cm³
27. 2 × 36 cm × 18 cm + 2 × 36 cm × 20 cm + 2 × 18 cm × 20 cm
28.