GRE math lesson 4

vertical angles the way you rotate change the angle answer is a and b sometimes GRE gives really same shape-> you have to make it different.

A pair of opposite congruent angles formed by intersecting lines

equilateral triangle

A triangle with three congruent sides (equal sides)

Let Roberta's present age = x. That means that Gene's present age is x+7.

Let Roberta's present age = x. That means that Gene's present age is x+7.

after 1, we have a units digit of 7, 2 9 3 3 4 1 period is four , and extend the pattern of using the multiples of the period

Strategy: 1. Focus on single -digit multiplication only. 2. Look for the repeating pattern (period often is 4) 3. Extend the pattern, using multiples the period

The ratio of c: d is one of the most special number in all mathematics pi

c: circumference d: diameter

The words " is" or " are" in the text correspond to the equals sign. if we have A is 50 more than B translates A= B+50 if we have A is 50 less than B translate A= B-50 Twice A is 100 less than three times B translates 2A=3B-100 A is 50% of B translates A=.5B A is 50% greater than B A=1.5 B

Since the tank starts half full, it would take these three pumps half the time to fill the rest—that's 6 hours.

The factors of 125 are {1, 5, 25, 125}

The only way to represent 125 as the product of three different factors is as 125 = 1*5*25. We could rearrange those three factors around the dimensions of the box, so any one of those three factors could be the length of the height.

A= 1/2 bh bigger triangle A= 16sqrt3 smaller triagle A= 4sqrt3 the shaded area = 14sqrt3

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