Sine, cosine and tangent of an acute angle

Answer Key - Grade 10 Math Worksheet - Challenge Me

Circle the best answer, or write your answer on the line.

1. 1.

   Jun draws right triangle QUV for a map poster, with the right angle at U. UV = 13 cm and QU = 84 cm. What is sin Q, as a fraction?

   13/85
2. 2.

   Kira draws right triangle QUV for a ramp poster, with the right angle at U. UV = 80 cm and QU = 39 cm. What is cos Q, as a fraction?

   39/89
3. 3.

   Milo draws right triangle QUV for a tent poster, with the right angle at U. UV = 60 cm and QU = 91 cm. What is cos Q, as a fraction?

   91/109
4. 4.

   Pia draws a 30-60-90 triangle with sides 4, 4√3 and 8. What is cos 30°, in simplest form?

   • √3/2
   • 1/2
   • √3
   • 2√3/3
5. 5.

   Ren draws a 30-60-90 triangle with sides 5, 5√3 and 10. What is tan 60°, in simplest form?

   • √3/3
   • √3
   • 2
   • √3/2
6. 6.

   Tala draws a 30-60-90 triangle with sides 6, 6√3 and 12. What is sin 60°, in simplest form?

   • √3
   • 1/2
   • √2/2
   • √3/2
7. 7.

   Zee measures a ramp triangle and finds cos D = 15/17, where ∠D is acute. What is tan D, as a fraction?

   8/15
8. 8.

   Ari measures a ladder triangle and finds cos D = 24/25, where ∠D is acute. What is sin D, as a fraction?

   7/25
9. 9.

   Bo measures a kite triangle and finds cos D = 12/13, where ∠D is acute. What is tan D, as a fraction?

   5/12
10. 10.

    Esme measures a tree triangle and finds cos D = 21/29, where ∠D is acute. What is sin D, as a fraction?

    20/29