а = х см
b = х + 6 см
P = 60 см
S = ? см²
1) P = (a + b) · 2
(х + х + 6) · 2 = 60
2х + 2х + 12 = 60
4х = 60 - 12
4х = 48
х = 48 : 4
х = 12
а = 12 см
2) b = 12 + 6
b = 18 см
3) S = a · b
S = 12 · 18
S = 216 см²
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Answers & Comments
а = х см
b = х + 6 см
P = 60 см
S = ? см²
1) P = (a + b) · 2
(х + х + 6) · 2 = 60
2х + 2х + 12 = 60
4х = 60 - 12
4х = 48
х = 48 : 4
х = 12
а = 12 см
2) b = 12 + 6
b = 18 см
3) S = a · b
S = 12 · 18
S = 216 см²