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6 >> 6 x 3 = 18 cm
2) k/9 = 16/12
k = (16 x 9)/12
= 12
3) 2500/x = 3500/21
x = (25 x 21)/35
= 15 cm
4) PQ² = PS x PR
RS² = PS x SR
RQ² = RS x RP
5) CD/AC = DE/AB
6) EF = (DC x AE + AB x DE)/(AE + ED)
9x = 27*6
x=162 / 9
x= 18
2. 16/12 = k/9
12k = 16*9
k = 144/12
k = 12
3. 25/21 = 35/x
25x = 735
x = 735/25
x= 29.4