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= ( 13 x 4 /2 x 2) + ( 6 x 5 ) + ( 6 x 8 )+ ( 5* x 6) + (4 x 6)
= ( 13 x 4) + 30 + 48 +30 + 24
= 52 + 30 +48+30+24
= 82 + 48+30+24
= 130 + 54
= 184 cm ²
NOTE
* menggunakan rumus pythagoras
Lp = 2(La) + ( 12 +5 +13) x20)
= 2 ( 12 x 5:2) + ( 30 x 20)
= 2 ( 30) + 600
= 60 + 600
= 660cm²
nomer 2
a = 8-5
= 3
sisi miring
La = (a+b) x t : 2
= (8 + 5) x 4 : 2
= 13 x 2
= 26 cm²
Lp = 2(La) + ( 5 + 5+ 8+4) x 6
= 2 (26) + ( 28 x 6)
= 52+ 168
= 220cm²