Grade 10

Cosine Law

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

10D.T3.02

Explore the development of the cosine law within acute triangles

10D.T3.03

Determine the measures of sides and angles in acute triangles, using the sine law and the cosine law

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