Keliling sebuah belah ketupat KLMN=60 cm. perbandingan panjang kedua digonalnya 3 : 4. luas belah ketupat KLMN = .... cm.
tolong jawab pakai cara. thanks.
tolong jawab pakai cara. thanks.
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60 = 4s
60 : 4 = s
15 = s
15 = √(1,5y)² + (2y)²
15 = √2,25y² + 4y²
15 = √6,25y²
15 = 2,5y
15 : 2,5 = y
6 = y
d1 = 3y = 3 x 6 = 18 cm
d2 = 4y = 4 x 6 = 24 cm
L = d1 x d2 x 1/2
L = 18 x 24 x 1/2
L = 18 x 12
L = 216 CM²