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1/2 KM = √52 : 2
=√13
t² = 13² - (√13)²
= 169 - 13
= 156
t = √156
= 2 √39 cm
b. tΔ² = 13² - 3²
= 169 - 9
= 160
tΔ₁ = √160
= 4√10 cm
tΔ² = 13² - 2²
= 169 - 4
= 165
tΔ₂ = √165 cm
Lp = La + 2LΔ₁ + 2LΔ₂
=(6 x 4) + 2(1/2 x 6 x 4√10) + 2(1/2 x 4 x √165)
= (24 + 24√10 + 4√165) cm²
c. LN = KM = √52
= 2√13 cm
L = 1/2 x a x t
= 1/2 x 2√13 x 2√39
= 1/2 x 4√507
= 1/2 x 4 x 14√3
= 28√3 cm²
d. V = 1/3 x La x tl
= 1/3 x (6 x 4) x 2√39
= 1/3 x 24 x 2√39
= 16√39 cm³