Topics
Trigonometry
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CanadaON
Grade 11

Sine and cosine laws

Lesson
Practice

Interactive practice questions

Solve for the length of side $a$a.

Round your answer to two decimal places.

A triangle has its interior angles marked with a purple-shaded arc outlined in blue. The left side has a length of $18$18 units and is opposite to interior angle measured $69^\circ$69°. The top side is labeled as $a$a, and is opposite to an angle measured as $33^\circ$33°.
Easy
2 min

Find the length of $a$a.

Round your answer to two decimal places.

Easy
3 min

Calculate the length of $y$y in metres.

Round your answer to one decimal place.

Easy
2 min

Find the value of angle $w$w in degrees.

Round the answer to two decimal places.

Easy
3 min
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Outcomes

11M.C.1.4

Describe conditions that guide when it is appropriate to use the sine law or the cosine law, and use these laws to calculate sides and angles in acute triangles

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