Summary
The height 'h' of a triangle ABC with base BC = 'a' is given by the formula: ..
The height 'h' of a triangle ABC with base BC = 'a' is given by the formula: ..To find height of a Triangle
(a) When the altitude falls within the base. In D ABC, AD is its height. Let AD = h and BC = a. Prove that In D ABC, In D ACD, BC = BD + DC (b) When the altitude falls outside the base In D ABC, ACB is obtuse..
(a) When the altitude falls within the base. In D ABC, AD is its height. Let AD = h and BC = a. Prove that In D ABC, In D ACD, BC = BD + DC (b) When the altitude falls outside the base In D ABC, ACB is obtuse..Natural Sine Tables
An extract from the Natural Sine tables is given below: Find from the tables the value of (i) sin 56 o (ii) sin 56 o 24 ' (iii) sin 56 o 28 ' . (i) sin 56 o Find 56 o on 'Natural Sines' tables in 'A' group. As there are no minutes, the value is read horizontally under the 0 ' column. sin 56 o = 0.8..
An extract from the Natural Sine tables is given below: Find from the tables the value of (i) sin 56 o (ii) sin 56 o 24 ' (iii) sin 56 o 28 ' . (i) sin 56 o Find 56 o on 'Natural Sines' tables in 'A' group. As there are no minutes, the value is read horizontally under the 0 ' column. sin 56 o = 0.8..To find q when tangent ratio is known
If find . = 51 o 23 ' can be 51 o 22 ' as well. Therefore, both answers are correct because mean difference for 4 ' and 5 ' is..
If find . = 51 o 23 ' can be 51 o 22 ' as well. Therefore, both answers are correct because mean difference for 4 ' and 5 ' is..Introduction
The t-ratios of acute angles are given in tables of natural sines, natural cosines and natural tangents. In this chapter, we will discuss (i) how to read trigonometric tables, (ii) how to find the angle when the value of a t-ratio is giv..
Natural Sine Tables
A special type of sine bar is sine centre which is used for conical objects having male and female parts.it cannot measure the angle more than 45 degree. Sine table is used to measure angles of large workpieces. As the angle has increased, sine ratio has increase..
Natural Tangent Tables
The tangent and cotangent came via a different route from the chord approach of the sine. These developed together and were not at first associated with angles. They became important for calculating heights from the length of the shadow that the object cast. The length of shadows was also of ..
Summary
sin A = cos (90 o - A) tan A . tan (90 o - A) = 1 sin 2 A + cos 2 A = 1 1 + tan 2 A = sec 2 A 1 + cot 2 A = cosec 2 ..
sin A = cos (90 o - A) tan A . tan (90 o - A) = 1 sin 2 A + cos 2 A = 1 1 + tan 2 A = sec 2 A 1 + cot 2 A = cosec 2 ..Introduction
The trigonometric ratio's are: Sine, Cosine, Tangent, Cotangent, Secant, and Cosecan..
Summary
i. The trigonometric ratio's are: Sine, Cosine, Tangent, Cotangent, Secant, and Cosecant. ii. sin A = cos (90 o - A). iii. sin A / cos a = tan A...
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