Question

Tolong ya nomer 7&8 sama cara/penjelasannya.. ini materi kesebangunan... terimakasih banyak..

Answer 1

Ed /bc = ad /ab
12 cm /21 cm =20/ab( kalikan silang)
12 ab =420 cm kuadrat
ab = 35 cm ( ad =20 cm berarti db = 15 cm)
ed / bc = ae /ec
12/21=16/ ac ( kalikan silang)
12 ac =336
ac = 336/12
ac = 28 ( kalau ae = 16 maka ec = 12 cm)

pq = 20 qs = 8 maka ps = 12
ps/pq=pt /pr( pr =pt+ tr)
12/20= pt / pt+10 ( kalikan silang)
12 pt +120 =20 pt
120 = 20 pt - 12 pt
120 =8pt
pt = 120/8
pt = 15 cm