Since π=3.14 and 1.75 should be half of π so cos(1.75) should be in the approximation of or .
Clearly Sam's calculator is in the degree mode since
is about and obviously, , So on the unit circle, it will be in the second quadrant.
Thus, cos(1.75) is negative.
|ab| = 1.4 = 4
h = 1.4 = 4
a(abc) area = 4.4 = 16/2 = 8
area of abc = 8 cm^2
good luck ! ; )