I need help in number 3 and 4 Please if you are not sure abo

I need help in number 3 and 4. Please if you are not sure about your answer, do not give it to me

part 3:

phi = BA cos wt

where, phi is the magnetic flux; B us the magnetic field; A is the area of the triangle; w is the angular frequency; t is time period;

A = 1/2*b*h = 0.5*0.36*0.52 = 0.0936 m^2

angular frequency, w = 2*pi/T = 2*3.14/1.2 = 5.236 rad/s

So,

phi = BA cos wt = 1.9*0.0936* cos [5.236*0.45 rad]

phi_0.45s = 0.12575 T.m^2

part 4:

emf = BAw sin wt

emf = 1.9*0.0936* 5.236 *sin [5.236*0.45 rad] = 0.6584 V

I₁ = emf/R

I₁ = 0.38732 A