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3
400 = 1 x (10x10) x t
3
400x3 = 100 x t
1200 = 100 x t
1200 = t
100
12 = t
tinggi segitiga = √t² + (1 x s)²
2
= √12²+5²
= √144 + 25
= √169
= 13 cm
jadi jawabannya yang C. 13
t = 400 /1/3x100
t = 400 x 3/100
t =12 cm
EF =√(1/2AB)² + t²
EF = √ 5² + 12²
EF = √25 + 144
EF = √169
EF = 13 cm