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Cosine Rule questions (1 Viewer)

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kpad5991

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In a parallelogram ABCD, angle ADC equals 60 degrees, AB = 9cm and AD= 3 cm. the point P lies on DC such that DP = 3 cm.

A) use the Cosine rule in triangle BCP to find BP.

B) let angle APB = x. Show that cos x = - root 7/ 14
 
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