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rumus nya A x T :2
36 = 10+2b
2b=36-10
b=26/2=13
kemudian cari tingginya:
akar 13 pangkat 2 - 10 pangkat 2
=akar 169-100
= akar 144=12. jadi tingginya 12
L= 1/2.a.t
=1/2.10.12 =60cm2