Matematika jawab yg bener yaaaa pliss​

Jawaban:

A. Luas = 1/2 × alas × tinggi

= 1×2 × 12 × (17-8)

= 6 × 9

= 54 cm²

Keliling = sisi + sisi + sisi

=14+14 +12

= 40 cm

B. luas = p×l

= 12×8

=96 cm²

keliling=2( 12+8)

= 2 × 20

= 40 cm