Datrys sin5^circ/7=sin40^circ/a

$$\frac { \sin 5 ^ { \circ } } { 7 } = \frac { \sin 40 ^ { \circ } } { a }$$

Datrys ar gyfer a

$$a = \frac{449951326780577510}{8715574274765817} = 51\frac{5457038767520869}{8715574274765817} \approx 51.62612498$$

Camau ar gyfer Datrys Hafaliad Llinol

Evaluate trigonometric functions in the problem

$$\frac{0.08715574274765817}{7} = \frac{0.6427876096865393}{a}$$

All y newidyn a ddim fod yn hafal i 0 gan nad ydy rhannu â sero wedi’i ddiffinio. Lluoswch ddwy ochr yr hafaliad wrth 7a, lluoswm cyffredin lleiaf 7,a.

$$a\times 0.08715574274765817=7\times 0.6427876096865393$$

Lluosi 7 a 0.6427876096865393 i gael 4.4995132678057751.

$$a\times 0.08715574274765817=4.4995132678057751$$

Rhannu’r ddwy ochr â 0.08715574274765817.

$$a=\frac{4.4995132678057751}{0.08715574274765817}$$

Ehangu \frac{4.4995132678057751}{0.08715574274765817} drwy luosi'r rhifiadur a'r enwadur gyda 100000000000000000.

$$a=\frac{449951326780577510}{8715574274765817}$$