# Form 2 Mathematics online video lessons on trigonometric ratios

Form 2 Mathematics online video lessons on trigonometric ratios

Lessons (**14**) * SHARE*

- 1.
Introduction to trigonometric ratios

7m 41s - 2.
Trigonometric ratios from mathematical tables

6m 55s - 3.
Evaluate:
8.52 tan 42.2°

0m 55s - 4.
Evaluate:
7.9 sin 79°

0m 42s - 5.
Evaluate:
#69/(cos 63.6°) #

1m 0s - 6.
Evaluate: #(7 cos 50.2° )/(9.5 sin? 60° )#

1m 49s - 7.
Use the figure below to find the unknown angles and sides in each case:
(a) #angle#PRQ = 46°, q = 7.83
(b) p = 13.6, q = 17.2

7m 6s - 8.
Use the figure below to find the unknown angles and sides in each case:
(a) #angle# QPR = 56°10', p = 4.53
(b) #angle# QPR = 47° 35', r = 3.47

8m 28s - 9.
In a triangle PQR, #angle#PQR = #angle#PRQ = 58° and QR = 5.2 cm. Calculate the length of PQ.

2m 6s - 10.
In a triangle PQR, QR = 5.2 cm and PQ = PR = 8.2 cm. Calculate:
(a) #angle#PQR and #angle#QPR.
(b) the area of #triangle# PQR.

6m 21s - 11.
In triangle XYZ, XY = XZ = 4.1 cm, XN is the altitude of the triangle, which is 3.2 cm long. Calculate:
(a) the base angles of the triangle.
(b) the size of the vertex angle.
(c) area of triangle XYZ.

6m 30s - 12.
Calculate the area of a parallelogram PQRS in which PS = 3.1 cm, PQ = 7.2 cm and #angle#SPQ = 73°.

2m 33s - 13.
The figure below shows a regular pentagon PQRST of side 5.2 cm. Find the length of PM if #angle#PMS 90° and M is the midpoint of RS.

4m 53s - 14.
A ship moves 4.5km on a bearing of 330°. It then changes its course to a bearing of 270° and moves 11km, then changes its course again to a bearing of 315° for 8km. Find to the nearest km, how far north and west the ship is from the starting point.

10m 2s

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