book Maths Puzzle Numerical Ability

i have no idea where to begin on this question. it is on a worksheet:
the measures of the angles in a triangle are in the ratio 2:5:8. Find the measures of the angles.

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book Other Question

What is Function notation? what is it used for? A medium sized pizza is 9" in diameter and costs $6.80. A large sized pizza is 12" in diameter and costs $9.95. What is the difference in the price per square inch between a medium and a large pizza? Round your answer to the nearest cent.