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3. luas = 80 x 10 = 800 dm²
4. sisi1 = 28 x 2 / 4 - 5 = 14 - 5 = 9 dm
5. sisi 2 = 400 x 2 / 20 - 30 = 40 - 30 = 10 cm
6. t = luas x 2 : (sisi1+sisi2) = 1040/52 = 20 m
= 1/2 x (20 + 30) x 10
= 1/2 x 50 x 10
= 250 cm²
3) luas trapesium = 1/2 x jumlah sisi sejajar x tinggi
= 1/2 x (50 + 30) x 20
= 1/2 x 80 x 20
= 800 dm²
4) luas trapesium = 1/2 x jumlah sisi sejajar x tinggi
28 = 1/2 x (a + 5) x 4
28 = 2 (a + 5)
28 = 2a + 10
2a = 28 - 10
2a = 18
a = 9 dm
5) luas trapesium = 1/2 x jumlah sisi sejajar x tinggi
400 = 1/2 x (30 + a) x 20
400 = 10 (30 + a)
400 = 300 + 10a
10a = 100
a = 10 cm
6) luas trapesium = 1/2 x jumlah sisi sejajar x tinggi
520 = 1/2 x (30 + 22) x t
520 = 1/2 x 52 x t
520 = 26 x t
t = 20 m
semoga membantu ya :)