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5 : 2
5y : 2y
K = 2(p+l)
K = 2(5y + 2y)
210 = 2(7y)
210 = 14y
210 : 14 = y
15 = y
L = p x l
L = (5y) x (2y)
L = 10y²
L = 10 x 15²
L = 10 x 225
L = 2250 m²
210 = 14
210 : 14 = 15
Panjang : 5x15 = 75
Lebar : 2x15 = 30
Luas = pxl = 75 x 30 =2250 d jawabannya