Jawaban:
b. 54
Penjelasan dengan langkah-langkah:
keliling = jumlah sisi-sisinya
36 = (x+3) + (2x+3) + 2x
36 = x + 3 + 2x + 3 + 2x
36 = 5x + 6
30 = 5x
x = 6
luas = 1/2 x alas x tinggi
luas = 1/2 x (2x6) x (6+3)
luas = 1/2 x 12 x 9
luas = 54
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Jawaban:
b. 54
Penjelasan dengan langkah-langkah:
keliling = jumlah sisi-sisinya
36 = (x+3) + (2x+3) + 2x
36 = x + 3 + 2x + 3 + 2x
36 = 5x + 6
30 = 5x
x = 6
luas = 1/2 x alas x tinggi
luas = 1/2 x (2x6) x (6+3)
luas = 1/2 x 12 x 9
luas = 54