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= 2.s².√3 + 6(1/2.a.t)
3
= 2/3.18.18√3 + 6(1/2.18.15)
= (216√3 + 810) cm²
2. a. (tinggi sisi tegak)² = 25² - 7²
= 625 - 49
= 576
tinggi sisi tegak = √576
= 24 cm
b. LΔ = 1/2.a.t
= 1/2.14.24
= 168 cm²
c. L permukaan = s² + 4LΔ
= 14² + 4(168)
= 196 + 672
= 868 cm²