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2 ( 9a + 5a ) = 84
2 ( 14a ) = 84
28a = 84
a = 3
pajang = 9 x 3 = 27
lebar = 5 x 3 = 15
luas = p x l
= 27 x 16
= 405 cm²
jawabnnya 405 cm²
84 = 2 * (p+l)
42 = p + l
panjang = 9/14 * 42 = 27 cm
lebar = 5/14 * 42 = 15 cm
L = p * l
= 27 * 15
= 405 cm²