# 11.4.2. The Cosine Rule

Given that is a triangle, where cm, cm, and , determine the value of , and approximate the result to the nearest thousandth.

• Acm
• Bcm
• Ccm
• Dcm
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Determine the perimeter of the triangle to the nearest cm, given that cm, cm, and .

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is a triangle, where cm, cm, cm, and , where cm. Determine the length of to the nearest hundredth.

• Acm
• Bcm
• Ccm
• Dcm
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In triangle , if cm, cm and , find the perimeter of the triangle to the nearest centimetre.

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Determine the greatest angle of the triangle to the nearest second, given that .

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• C
• D
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Find, to the nearest second, the measure of the greatest angle of the triangle in which cm, cm, and cm.

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• D
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In a triangle , cm, cm, and . Find the approximated to the nearest second.

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• C
• D
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is a triangle where cm, cm, and its perimeter equals cm. Determine the values of and .

• Acm, cm
• Bcm, cm
• Ccm, cm
• Dcm, cm
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Given that is a triangle in which cm, cm, and the perimeter of the triangle is cm, determine the triangle’s greatest angle approximating the result to the nearest second.

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• B
• C
• D
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Solve the triangle below approximating the lengths to the nearest centimetre and the measures of angles to the nearest second.

• Acm, ,
• Bcm, ,
• Ccm, ,
• Dcm, ,
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Solve the triangle approximating the measures of angles to the nearest second.

• A, ,
• B, ,
• C, ,
• D, ,
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Given that in a triangle , find .

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Given that , , and are cities, determine the distance between the cities and to the nearest kilometre.

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Find the area of the triangle to the nearest centimeters, given that cm, cm, and cm.

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• B
• C
• D
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