15. L. belah ketupat = ½ × d1 × d2
= ½ × 24 × 27
= 12 × 27
= 324 cm² (B)
16. persegi panjang (A)
17. layang-layang (B)
18. kedua diagonalnya sama panjang (C)
19. s = 8 cm
K = 4 × s
= 4 × 8 cm
= 32 cm
L = s × s
= 8 cm × 8 cm
= 64 cm²
32 dan 64 (D)
20. K = 162 dm
p = 56 dm
l = ???
K = 2 × ( p + l )
162 = 2 × ( 56 + l )
162 : 2 = 56 + l
81 = 56 + l
l = 81 - 56
l = 25 dm (B)
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15. L. belah ketupat = ½ × d1 × d2
= ½ × 24 × 27
= 12 × 27
= 324 cm² (B)
16. persegi panjang (A)
17. layang-layang (B)
18. kedua diagonalnya sama panjang (C)
19. s = 8 cm
K = 4 × s
= 4 × 8 cm
= 32 cm
L = s × s
= 8 cm × 8 cm
= 64 cm²
32 dan 64 (D)
20. K = 162 dm
p = 56 dm
l = ???
K = 2 × ( p + l )
162 = 2 × ( 56 + l )
162 : 2 = 56 + l
81 = 56 + l
l = 81 - 56
l = 25 dm (B)
semoga membantu