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1/2 x p x l = 240
1/2 x 16 x l = 240
l = 30
Lalu pakai rumus phytagoras untuk mencari "r" atau sisi luar belah ketupat
(1/2 x p)² + (1/2 x l)² = r²
8² + 15² = r²
64 + 225 = r²
289 = r²
r= 17
Keliling belah ketupat
4r = 68