What is the largest perfect square of 45?

You need to factor this number into a product of two numbers, one of which must be a perfect square. Then you take the square root of this perfect square and get a rational number.
So, the factors of 45 are 1, 3, 5, 9, 15, and 45.
As you can see, number 9 is the largest perfect square here. 

Answer d; a supplementary angle = 180°, so if that angle = 150°, y would = 30°.

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