Bantu jawab, menggunakan cara nya

Bantu jawab, menggunakan cara nya

$p =( 3x - 5) : cm$

$l =( x + 7) : cm$

$K = 228 \ 2(p + l) = 228 \ p + l = 114 \ (3x - 5) +( x + 7) = 114 \ 4x + 2 = 114 \ 4x = 112 \ x = 28$

$p = 3x - 5 \ p = 3(28) - 5 \ p = 79 : cm$

$l = x + 7 \ l = 28 + 7 \ l = 35 : cm$

$L = p times l \ L = 79 times 35 \ L = 2765 : cm {}^{2}$

$d_{1} = d_{2} \ 3x + 15 = 5x + 5\ 3x - 5x = 5 - 15 \ - 2x = - 10 \ x = 5$

$d_{1} = d_{2} = 3x + 15 \ = 3(5) + 15 \ = 30 : cm$