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20 = 7 + 2a + 4a + -5
20 = 2 + 6a
20-2 = 2 - 2 + 6a
18 = 6a
18 x 1/6 = 6/a x 1/6
3 = a
maka nilai a adalah 3
sisi 2 = 2a cm
sisi 3 = 4a-5 cm
Dit : a
Jawab :
K = sisi1 + sisi2 + sisi3
7 cm+ 2a cm + 4a cm - 5 cm = 20 cm
2 cm + 6a cm = 20 cm
6a cm= 20 cm - 2 cm
6a cm= 18 cm
a = 18 cm/6
a = 3 cm