exam Maths Puzzle Numerical Ability

How do I calculate the sum of the Interior angles of a convex 18-gon

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exam Other Question

What is the area of a rectangle with a length of 45 and diagonals of 51? A rectangular swimming pool is twice as long as it is wide. A small walkway surrounds the pool. The walkway is a constant 2 feet wide and has an area of 196 square feet. Find the dimensions of the pool.: