6. x + 15 + 3x + 10 + 35 = 180
4x + 60 = 180
4x = 180 - 60
4x = 120
x = 30
8. L. segitiga = a x t / 2
= 12 x 12 / 2
= 144 / 2
= 72 cm²
10. L. persegi = s²
= 12²
= 144 cm²
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6. x + 15 + 3x + 10 + 35 = 180
4x + 60 = 180
4x = 180 - 60
4x = 120
x = 30
8. L. segitiga = a x t / 2
= 12 x 12 / 2
= 144 / 2
= 72 cm²
10. L. persegi = s²
= 12²
= 144 cm²