K = 2 (p + l)
100 = 2 (3a + 4 + a - 2)
100 = 2 (4a - 2)
100 = 8a - 4
8a = 100 + 4
8a = 104
a = 104/8
a = 13 cm
L = p × l
= (3a + 4) cm × (a - 2) cm
= (3(13) + 4) cm × (13 - 2) cm
= (39 + 4) cm × 11 cm
= 43 cm × 11 cm
= 473 cm²
K = 2p + 2l
100 = 2 ( 3a + 4 ) + 2 ( a - 2 )
100 = 6a + 8 + 2a - 4
100 = 6a + 2a + 8 - 4
100 = 8a + 4
8a = 100 - 4
8a = 96
a = 12 cm
L = ( 3a + 4 ) × ( a - 2 )
L = 3a ( a - 2 ) + 4 ( a - 2 )
L = 3a² - 6a + 4a - 8
L = 3(12²) - 6(12) + 4(12) - 8
L = 3(12 × 12) - 72 + 48 - 8
L = 3 (144) - 72 + 48 - 8
L = 432 - 72 + 48 - 8
L = 360 + 48 - 8
L = 408 - 8
L = 400 cm²
Atau
L = ( 3(12) + 4 ) × ( 12 - 2 )
L = ( 36 + 4 ) × 10
L = 40 × 10
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K = 2 (p + l)
100 = 2 (3a + 4 + a - 2)
100 = 2 (4a - 2)
100 = 8a - 4
8a = 100 + 4
8a = 104
a = 104/8
a = 13 cm
L = p × l
= (3a + 4) cm × (a - 2) cm
= (3(13) + 4) cm × (13 - 2) cm
= (39 + 4) cm × 11 cm
= 43 cm × 11 cm
= 473 cm²
K = 2p + 2l
100 = 2 ( 3a + 4 ) + 2 ( a - 2 )
100 = 6a + 8 + 2a - 4
100 = 6a + 2a + 8 - 4
100 = 8a + 4
8a = 100 - 4
8a = 96
a = 12 cm
L = p × l
L = ( 3a + 4 ) × ( a - 2 )
L = 3a ( a - 2 ) + 4 ( a - 2 )
L = 3a² - 6a + 4a - 8
L = 3(12²) - 6(12) + 4(12) - 8
L = 3(12 × 12) - 72 + 48 - 8
L = 3 (144) - 72 + 48 - 8
L = 432 - 72 + 48 - 8
L = 360 + 48 - 8
L = 408 - 8
L = 400 cm²
Atau
L = p × l
L = ( 3a + 4 ) × ( a - 2 )
L = ( 3(12) + 4 ) × ( 12 - 2 )
L = ( 36 + 4 ) × 10
L = 40 × 10
L = 400 cm²