Tolong jawab secepatnya ya​

a.

L = 1/2 × a × t

L = 1/2 × 8 × 10

L = 8 × 10/2

L = 80/2

L = 40 cm²

b.

L = 1/2 × a × t

L = 1/2 × 12 × 15

L = 12 × 15/2

L = 180/2

L = 90 dm²

c.

L = 1/2 × a × t

L = 1/2 × 10 × 12

L = 10 × 12/2

L = 120/2

L = 60 m²

d.

L = 1/2 × a × t

L = 1/2 × 14 × 16

L = 14 × 16/2

L = 224/2

L = 112 mm²