Math Help - Help with area and means

1. Help with area and means

hello is there anybody that can explain how to work out these questions, i would really appreciate it.

Q1. Find the area of this shape.

Q2. In Class A the mean average score in a French exam was 72%. In Class B the mean average score in a French exam was 84%. There are 30 students in Class A and 26 students in Class B.

Calculate the mean average score for the two classes combined. Give your answer to 3 significant figures.

2. Well for the first part the area of the square is just 8 x 8 = 64
The area of a circle is $\pi r^2$ so the area of a semi circle is just that divided by 2 which in this care is $8 \pi$
So total area is 64 + $8 \pi$

For the second part i would do the sum $0.72 x 30 + 0.84 x 26$

and then divide this by the total number of students which is 56. So the answer is 0.776 to 3 decimal places