Suatu segitiga, panjang alas = (x-2)cm dan tingginya 8 cm, jika luas segitiga tersebut 104 cm² maka panjang alas nya adalah?
liwonsubagyo
Luas = 1/2 x a x t 104 = 1/2 x ( x - 2 ) x 8 (x - 2 ) x 8 = 104 x 2 8x - 16 = 208 8x = 208 + 16 8x = 224 x = 28 Panjang alasnya = x - 2 = 28 - 2 = 26cm
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magica
2 x luas = a x t 2 x 104 = (x-2) x 8 208 = 8(x-2) 208 = 8x-16 208+16 = 8x 224 = 8x x = 224/8 = 28 panajang alas = 28 - 2 = 28 - 2 = 26 cm
104 = 1/2 x ( x - 2 ) x 8
(x - 2 ) x 8 = 104 x 2
8x - 16 = 208
8x = 208 + 16
8x = 224
x = 28
Panjang alasnya = x - 2
= 28 - 2
= 26cm
2 x 104 = (x-2) x 8
208 = 8(x-2)
208 = 8x-16
208+16 = 8x
224 = 8x
x = 224/8 = 28
panajang alas = 28 - 2 = 28 - 2 = 26 cm