I would be able to but i left my maths book at school and that has the explanation in, sorry :(
Answer:
Step-by-step explanation:
The second one I believe.
Answer:
75.7m^2
Step-by-step explanation:

Answer:
you would calculate angles with a protractor by using degrees.
Step-by-step explanation:
the center would be put at one corner and then u measure the side you want to know the angle of. hope this helped.