sinSine, cosine, tangent: math practice, grades 8–9

Practise “Sine, cosine, tangent” online for free. Five right answers in a row make the tasks harder, two mistakes in a row make them easier. Right answers earn coins for games.

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Example problems

These are only examples: the practice makes new tasks every time.

1. Triangle ABC has a right angle at C.

   sin A = ?

   Answer

   5/13

2. Triangle ABC has a right angle at C.

   cos A = ?

   Answer

   3/5

3. Triangle ABC has a right angle at C. Find the side marked “?”.

   a = ?

   Answer

   9

4. Triangle ABC has a right angle at C. Find the side marked “?”.

   b = ?

   Answer

   7

5. Triangle ABC has a right angle at C and sin A = 4/5. Find the side marked “?”.

   a = ?

   Answer

   12

6. Triangle ABC has a right angle at C and tan A = 4/3. Find the side marked “?”.

   a = ?

   Answer

   8

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