Level 7 - NCEA Level 2

Cosine Rule

Interactive practice questions

Find the length of $a$a using the cosine rule.

Round your answer to two decimal places.

A triangle with its vertices labeled as A, B, and C. The angle at vertex A measures $33^\circ$33°. The side opposite to the $33^\circ$33° angle, side $BC$BC, is labeled $a$a units, indicating its unknown length. Side $AB$AB measures $30$30 units, as shown by the scale line beneath it. Side $AC$AC measures $13$13 units. Side $AB$AB and Side $AC$AC are adjacent to the $33^\circ$33° angle at vertex A.

Easy

3min

Find the length of $a$a using the cosine rule.

Round your answer to two decimal places.

Easy

2min

Find the length of $a$a using the cosine rule.

Round your answer to two decimal places.

Easy

2min

Find the length of $q$q using the cosine rule.

Round your answer to two decimal places.

Easy

2min

Outcomes

M7-4

Apply trigonometric relationships, including the sine and cosine rules, in two and three dimensions

91259

Apply trigonometric relationships in solving problems

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