contestada

4.
Triangle DEF is shown below.
E
19-6 m
I
10-4 m
13-2 m
D
It has sides of length 10.4metres, 13.2metres and 19.6metres.
Calculate the size of angle EDF.

4 Triangle DEF is shown below E 196 m I 104 m 132 m D It has sides of length 104metres 132metres and 196metres Calculate the size of angle EDF class=

Respuesta :

alexanderorangeguy

Answer:

111.75 degrees

Step-by-step explanation:

EDF = cos^-1((b²+c²-a²)/2bc)

EDF = cos^-1((10.4²+19.6²-13.2²)/2(10.4)(19.6))

EDF = 111.75 degrees