25.luas bangun pd disamping adlh.... 26...?

25.
Luas Layang - Layang
= 1/2 x d1 x d2
= 1/2 x 20 dm x 8 dm
= 80 dm²

Luas Trapesium
= 1/2 x (12 dm + 8 dm) x 10 dm
= 1/2 x 20 dm x 10 dm
= 100 dm²

Luas seluruh
= Luas layang - layang + L. trapesium
= 80 dm³ + 100 dm³
= 180 dm3 (A)

26.
K. Persegi P. = 2p + 2l
160 m = 2(45) m + 2l
160 m = 90 m + 2l
2l = 160 m - 90 m
2l = 70 m
l = 35 m (lebar)

Luas persegi panjang
= panjang x lebar
= 45 m x 35 m
= 1575 m² (D)

Semoga membantu :)

25.
L1 = trapesium
= 1/2×(a+b)×t
= 1/2×(8+12)×10
= 1/2×20×10
= 200÷2 = 100 dm^2

L2= Jajar genjang
= a×t
=8×10
= 80

LGAB = L1+L2
= 100+80 = 180dm^2 (a)

26.
lebar psg pjg= 160m-45×2
=160-90
=70m÷2= 35m

luas= p×l = 45×35=1.575 m^2(d)
.
semoga bermanfaat.