If , , and are given in a triangle, and and are two possible values of the third side…

MATHEMATICS · Single correct · GCSE · Mathematics · Geometry and Measures · Geometry and Measures

Problem

a

b

, and

A

are given in a triangle, and

c_1

and

c_2

are two possible values of the third side such that

c_1^2+c_1c_2+c_2^2=a^2

, then

A

is equal to (1)

30^\circ

(2)

60^\circ

(3)

90^\circ

(4)

120^\circ