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berarti diagonal 1 nya lagi = = = 12 cm x 2 = 24 cm diagonal 1 nya lagi
L = 1/2 x d1 x d2 = 1/2 x 10 x 24 = 120 cm²
13.) L trapesium = (jumlah sisi sejajar) x t / 2
180 = ((x+4) + (3x+2)) dikali 2x / 2
180 = (4x + 6) dikali x
0 = 4x² + 6x -180
(4x+30) (x-6)
x = 6 / -7,5
ambil x = 6 => sisi atas = 6+4 = 10
sisi bawah = 3(6) + 2 = 20
t = 2(6) = 12
sisi samping =
jadi keliling = sisi atas + sisi bawah + 2 sisi samping
=10 + 20 + 2 (13)
= 30 + 26 = 56
^^