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20. Trigonometry
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iGCSE (2021 Edition)

20.01 Trigonometric ratios

Lesson
Worksheet
Practice

Interactive practice questions

Which of the following is the hypotenuse of the triangle shown?

A right-angled triangle $\triangle ABC$△ABC has its right angle located at vertex $A$A as indicated by a corner square symbol. The triangle is oriented such that vertex $A$A is at the top-right, vertex $B$B is at the top-left, and vertex $C$C is at the bottom right. Sides $interval(AB)$interval(AB) and $interval(AC)$interval(AC) are perpendicular to each other. Side $interval(BC)$interval(BC) is opposite to vertex $A$A.

$AB$AB

A

$BC$BC

B

$AC$AC

C
Easy
< 1min

Which of the following is the opposite side to angle $\theta$θ?

Easy
< 1min

Which of the following is the adjacent side to angle $\theta$θ?

Easy
< 1min

Identify the angle that is opposite the hypotenuse.

Easy
< 1min
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Outcomes

0580C6.2B

Apply the sine, cosine and tangent ratios for acute angles to the calculation of a side or of an angle of a right- angled triangle.

0580E6.2B

Apply the sine, cosine and tangent ratios for acute angles to the calculation of a side or of an angle of a right- angled triangle.

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