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secondary 3 | E Maths
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hi I need help with this question
Date Posted: 3 years ago
Views: 297
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A)
Use cosine rule :
125^2 = 84^2 + 58^2 - 2(84)(58)cos(BDC)
B)
Use sine rule.
Sin (55) = AD/58
C)
Use triangle area formula : 1/2*a*b*sinC
Area of BDC = 1/2 * 84 * 58 * Sin(BDC)
Use cosine rule :
125^2 = 84^2 + 58^2 - 2(84)(58)cos(BDC)
B)
Use sine rule.
Sin (55) = AD/58
C)
Use triangle area formula : 1/2*a*b*sinC
Area of BDC = 1/2 * 84 * 58 * Sin(BDC)
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