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255 = (a + b) : 2 x t
255 = (a + 21) : 2 x 15
255 x 2 : 15 = a + 21
34 = a + 21
a = 13 dm
2
255=(sisi1+21).15
2
255.2=(sisi1+21).15
510=(sisi1+21).15
510:15=(sisi1+sisi2)
34=sisi1+21
sisi1=34-21
=13 dm
jika membantu kasih bintang ya....