bantu nomor 20 pakek cara

L= sxs
= 20x20 = 400 cm²
L= 1/2xaxt
= 1/2x7x8
=28 x2 ( karena segi3 nya ada 2 )
=56 cm²
LB= 400-56=344cm²
maaf kalau salah...

L.total = L.persegi - 2L.segitiga

Lpersegi = 20×20 = 400cm²

L. segitiga = a×t/2
a = (20 - 6)/2 = 7cm
t = 20 - 12 = 8cm
L.segitiga = 7×8/2 = 28cm²

L.total = 400 - 2×28 = 344cm² (C)

Mohon maaf bila ada kesalahan