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½(20+30)×20
=½×50×20
=500cm²
8.
16×t=480
t=480:16
t=30
9.
((18+18)×24)-(½(18+18)×24))
=864-432
=432
10.
(¼×3,14×20²)-(10×10)
=314-100
=214
11.
v=22/7×14²×30
v=22×2×14×30
v=18480cm³
=pxl
=27x16 2/3
=27x50/3
=9x50=450
7)Luas persegi
=sxs
=20x20
=400
Luas segitiga
=½xaxt
=½x10x20
=100
Luas gabungan 400+100=500
9)Luas persegi panjang
=pxl
=24x32
=768
Luas belah ketupat
=½xd1xd2
=½x24x32
=½x768
=384
Luas yg duarsir 768-384=384
semoga membantu^_^