tolong di jwb no 3 pke cara.....pliss bsok soalnya mau d kumpulin trimks......

bangun 1 = segitiga
bangun 2 = persegi
bangun 3 = segitiga

luas 1 = a × t ÷ 2
=28 cm × (96 cm - 26 cm)
=28 cm × 70 cm = 1.960 cm2
= 1.960 cm2 ÷ 2 = 980 cm2

luas 2= p×l
=26 cm × 28 cm
=728 cm2

luas 3 = a×t÷2
=28 cm × (96 cm - 26 cm)
=28 cm × 70 cm = 1.960 cm2
= 1.960 cm2 ÷ 2 = 980 cm2

luas gabungan = 980 cm2 + 782 cm2
= 1.708 cm2 +980 cm2
=2.688 cm2