Ответ:
P = 2×(a + b).
a = 3×b
P = 2×(3×b + b) = 2×4×b = 8×b.
b = P/8 = 24/8 = 3 см.
a = 3×3 = 9 см.
S = a×b.
S = 9×3 = 27 см²
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Ответ:
P = 2×(a + b).
a = 3×b
P = 2×(3×b + b) = 2×4×b = 8×b.
b = P/8 = 24/8 = 3 см.
a = 3×3 = 9 см.
S = a×b.
S = 9×3 = 27 см²