The figure is not drawn to scale. Triangle NPM is an isosceles triangle. Triangle KLM is an equilateral triangle. ∠PMN is
25 of ∠LKM and ∠LMP = ∠KMN.
- Find ∠LMP.
- Find ∠KNM.
(a)
∠LMK = 60° (Equilateral triangle)
∠PMN
= ∠LMK x
25 = 60° x
25 = 24°
∠LMP = ∠KMN
∠LMP
= ∠LMK - ∠PMA) ÷ 2
= (60° - 24°) ÷ 2
= 36° ÷ 2
= 18° (Isosceles triangle)
(b)
∠KNM
= 180° - ∠LKM - ∠LMP
= 180° - 60° - 18°
= 102° (Angles sum of triangle)
Answer(s): (a) 18°; (b) 102°