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Form 2 Mathematics online video lessons on trigonometric ratios
Calculate the area of a parallelogram PQRS in which PS = 3.1 cm, PQ = 7.2 cm and #angle#SPQ = 73°.
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1.
Introduction to trigonometric ratios
2.
Trigonometric ratios from mathematical tables
3.
Evaluate: 8.52 tan 42.2°
4.
Evaluate: 7.9 sin 79°
5.
Evaluate: #69/(cos 63.6°) #
6.
Evaluate: #(7 cos 50.2° )/(9.5 sin? 60° )#
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
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
9.
In a triangle PQR, #angle#PQR = #angle#PRQ = 58° and QR = 5.2 cm. Calculate the length of PQ.
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.
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.
12.
Calculate the area of a parallelogram PQRS in which PS = 3.1 cm, PQ = 7.2 cm and #angle#SPQ = 73°.
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.
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.
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