Topics
Trigonometry
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CanadaON
Grade 11

Sine and cosine law

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

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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