19. PR=QR=15cm
15cm+15cm+PQ=50
PQ=20cm
20. 3/12×168cm=42cm
21. 476cm2=28cm×a
a=476cm2/28cm
a=17
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19. PR=QR=15cm
15cm+15cm+PQ=50
PQ=20cm
20. 3/12×168cm=42cm
21. 476cm2=28cm×a
a=476cm2/28cm
a=17
PR= 15
PQ= 15
ditan PQ?
jawab: PQ = K -(PR+QR)
= 50-(15+15)
=20 cm
20.) 3/12 x 168 = 42 cm
21.) L = 1/2 x A xt
238 = 1/2xAx28
238 =Ax14
A = 238:14
A =17 cm