Persegi panjang dengan ukuran panjang (3x+1)cm, lebar (2x+3)cm, dan keliling nya 98cm. Berapa lebar persegi panjang?
A.21
B.22
C.23
D.24
A.21
B.22
C.23
D.24
Jawaban:
Kll = 2 (p + l)
98 = 2 (3x + 1 + 2x + 3)
98 = 2 (5x + 4)
98 = 10x + 8
98 - 8 = 10x
90 = 10x
90 ÷ 10 = x
9 = x
l = 2x + 3
l = 2 (9) + 3
l = 18 + 3
l = 21 cm
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