Question

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

Answer 1

Sine rule

Answer 2

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

Answer 3

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