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24 = 7x + 3
7x = 24 - 3
7x = 21
x = 3
( 2x ) cm = ( 2 × 3 ) cm = 6 cm
( 2x + 2 ) cm = ( 2 × 3 + 2 ) cm = 8 cm
( 3x + 1 ) cm = ( 3 × 3 + 1 ) cm = 10 cm
Panjang sisi terpanjang adalah 10 cm
= 2x + (2x + 2) + (3x + 1)
= 2x + 2x + 2 + 3x + 1
= 2x + 2x + 3x + 2 + 1
= 7x + 3
7x + 3 = 24
7x = 24 - 3
7x = 21
x = 21 / 7
x = 3
panjang sisi-sisinya :
2x = 2(3) = 6 cm
2x + 2 = 2(3) + 2 = 6 + 2 = 8 cm
3x + 1 = 3(3) + 1 = 9 + 1 = 10 cm
jadi panjang sisi yang terpanjang adalah 10 cm