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t = x
luas = a.t
98 = 2x . x
98 = 2xkuadrat
98 : 2 = x kuadrat
49 = x kuadrat
√49 = x
7 = x
a = 2x = 2 . 7 = 14
t = x = 7
98=a*t
98=a*2*a
98/2=a²
49=a²
a=√49
a=7
jadi:a=7 cm
t=2*a=2*7=14 cm