Half-wave rectifier

1. The problem statement, all variables and given/known data
Determine the value of
a)Ignition Angle
b)Average Output Voltage
c)RMS Output Voltage
d)Rectification Efficiency
e)Ripple Factor
for a half-wave rectifier,if the rms value of the input ac signal is 230V.

2. Relevant equations
Anyone can help me solve the question by showing the formula and steps(if can).
I have the simple quiz at last week but i totally not confident with my solution.

3. The attempt at a solution

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