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caranya rumus layang "= d1×d2:2
10×24=240:2=120
maaf ya kalau salah jadiin jawaban terbaik dong
kell = 2(p+l)
80=2(3x+x)
80=6x+2x
80=8x
10=x
Lpersegi panjang = p.L = 3x . x = 3.10.10 =300 cm2
39) C. 52 cm
Lpersegi = s.s
169=s2
√169 =s
13=s
kell persegi = 4s = 4.13 = 52 cm
40) B. 120 cm2
llayang2 = d1.d2 dibagi 2
= 10.24/2
120 cm2