Keliling bangun ABCD pada gambar di bawah adalah... cm. A 20 cm B 12 cm C D 9 cm
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Jawaban:
caranya pake rumus phytagoras
Jawab:
BD = √12²+9²
BD = √144+81
BD = √225
BD = 15 cm
AD = √20²+15²
AD = √400+225
AD = √625
AD = 25 cm
Keliling = jumlahkan semua sisinya (ABCD)
K = 20+12+9+25
K = 32+34
K = 66 cm