Topics
Trigonometry
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CanadaON
Grade 11

Cosine law

Lesson
Practice

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
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Outcomes

11U.D.1.6

Pose problems involving right triangles and oblique triangles in two dimensional settings, and solve these and other such problems using the primary trigonometric ratios, the cosine law, and the sine law (including the ambiguous case)

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