Question

100 poin kak,
tolong pake cara yah

Answer 1

K ABC
= AB + BC + AC
= 2a + 2a + a
= 5a

s = 1/2 × K
s = 1/2 × 5a
s = 5a/2

L ABC = √[s . (s - a) . (s-b) . (s-c)]
L ABC = √[5a/2 . (5a/2 - 2a) . (5a/2 - 2a) . (5a/2 - a)]
L ABC = √[5a/2 . (5a/2 - 4a/2) . (5a/2 - 4a/2) . (5a/2 - 2a/2)]
L ABC = √(5a/2 . a/2 . a/2 . 3a/2)
L ABC = (a²√15)/4 cm²

V = La . t
V = (a²√15)/4 . 4
V = a²√15 cm³

Jawaban: C