rumus pendukung :
a² = b² + c² – 2bc cos α
PR² = QR² + PQ²– 2 x QR x PQ cos Q
= 6² + 4²– 2x6x4 cos 60˚
= 36+16 – 48 x ½
= 52-24
PR= √28
= 2√7 cm
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rumus pendukung :
a² = b² + c² – 2bc cos α
PR² = QR² + PQ²– 2 x QR x PQ cos Q
= 6² + 4²– 2x6x4 cos 60˚
= 36+16 – 48 x ½
= 52-24
PR= √28
= 2√7 cm