find the perimeter of isosceles triangle with base of 22 cm and vertical angle of 36.

Question

kc_kennylau · Answer

Sine rule

anonymous · Answer

i dont quite understand the rule i know you have to use it but im confused

anonymous · Answer

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the angle bisector of the vertical angle of an isoceles triangle is perpendicular to the base and bisects it ( you can prove the two triangles formed to be congruent).  
sine rule can be a applied to a right angled traingle ..so in the second figure you have two right angles triangle  
in triangle ADB , sin A = perpendicular / hypotenuse  
perpendicular is 11 cm 
sin 16 = 0 .2756