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luas sisi ( Lp)
Lp = 2 (L) + ( K x t)
= 2 ( 20 x 21 : 2) + ( ( 20 + 21 + 29) x 30)
= 2 ( 210) + ( 70 x 30)
= 420 + 2100
= 2520 cm²
jawabannya adalah 2520 cm²
= akar 400 +441 =akar 841 = 29 cm
L= Lalas + Lsisitgk a + Lsisitgk b + Lsisitgk c
L=(20x21/2) + (20x30) + (21x30) + (29x30)
L=210+600+630+870
L=2310 cm2