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98=2(21)+2h
98=42+2h
98-42=2h
56/2=h
h=28
Sacamos la diagonal por pitágoras
d^2=b^2+h^2
d^2=(21^2)+(28^2)
d^2=441+784
d^2=1225
d=raizcuad.(1225)
d=35 cm
Su base mide: 21cm
base + base + lado + lado = 98cm
21 + 21 + 2L = 98
42 + 2L = 98
2L = 56
L= 28
B=21
L=28
21^2 + 28^2 = (Diagonal)^2
441 + 784 = (Diagonal)^2
1225 = Diagonal^2
Diagonal = 35
Espero te sirva. =)