x = altura
20 + x = base
perímetro de un rectángulo es:
ancho * 2 + largo * 2 = perímetro->
2 (20 + x) + 2 x = 172 ->
40 + 2 x + 2 x = 172 ->
40 + 4 x = 172 ->
4 x =172 - 40 ->
4 x = 132 ->
x = 132/4 ->
x = 33
altura 33 dm
base 20 + 33 = 53 dm
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x = altura
20 + x = base
perímetro de un rectángulo es:
ancho * 2 + largo * 2 = perímetro->
2 (20 + x) + 2 x = 172 ->
40 + 2 x + 2 x = 172 ->
40 + 4 x = 172 ->
4 x =172 - 40 ->
4 x = 132 ->
x = 132/4 ->
x = 33
altura 33 dm
base 20 + 33 = 53 dm