Question

Tow side of a triangle measure 7cm.
and on. The length of the third
sid so can
be -
(a) 17 cm
76) 7.9 cm
(C)
(c) 20cm
(d) 18.5 cm​

Answer 1

Answer:

If the third side is assumed to be 3

the the cos of the angle opposite the side of size 7 is given by

cos C = [a^2+b^2-c^2]/[2ab]

cos C = [3^2+3^2 -7^2][2(3)(3_] = -31/18

31/18>1 but cos C =1 when a maximum

The required side must be 7