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B = 30°
C = 180 - 90 - 30
C = 60°
Ilustrasi (A bawah kiri, B atas, C bawah kanan)
A menghadap sisi miring BC
B menghadap garis AC
C menghadap garis AB
A:B:C = BC:AC:AB
90:30:60 = BC:AC:AB
3:1:2 = BC:AC:AB
AC = 14 cm
BC = 3/1 × 14
BC = 42 cm
AB = 2/1 × 14
AB = 28 cm
L = a × t / 2
L = 14 × 28 / 2
L = 196 cm^2