Jawabanmu

2014-05-19T22:07:52+07:00
L = 1/2 × d_{1} × d_{2}

A. L = 1/2 × 9 × 12
    L = 9 × 6 = 54 cm²

B. L = 1/2 × 12 × 16
    L = 6 × 16 = 96 cm²

C. L = 1/2 × 8y × 7y
    L = 1/2 × 56y²
    L = 56y²/2


Maaf kalau ada kesalahan :)