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K. persegi panjang = 2 x 20 = 40
K. seluruhnya = 31,4 + 40 = 71,4
gak ada pilihannya.
lintasan = 2p + πd
= ( 2 x 20) + ( 3,14 x 10)
= 40 + 31,4
= 71,4 cm
jawabn gak ada di pilihan namun sudah benar kok
jawaban nomer 9
busur = 120/360 x 2 x π x r
= 1/3 x 2 x 22/7 x 7
= 1/3 x 44
= 44/3
= 14 2/3 cm
soal nomer 10 sudut pusatnya gak kelihatan maaf