ACT Mistake

Hexagon Inscribed in circle rules

Given diameter, find radius, a hexagon is six-sided made of 6 equilateral triangles, then find perimeter by multiplying side length x 6

2 part ratio

given a ratio, write as fraction, then set it equal fraction expression that allows you to solve for unknown ex: 3 concentrated:40 (ratio) water = x concentrated/5 water (gallons)

sequences

3 part ratio 

a:b:c = ax:bx:cx ex: sum 3 pos integers is 180, ratio 5:3:2, what is value of smallest of integers? 5x+3x+2×=180, then plug into x value into 2x

Circle formula

(x-h)²+(x-k)²=r² r=radius (h,k) is center of circle

circle formula application

ex. In the standard (x,y) coordinate plane, how many points are both 5 coordinate units from the origin and also 2 coordinate units from the line y = 0? answer is 4, solve

Triangle rule

Side opposite a larger angle is longer ex. In nABC, if the measure of ∠A is less than the measure of ∠B, and the measure of ∠B is less than the measure of ∠C, what is the correct ordering of the side lengths, from least to greatest? A. AB < BC < AC B. AB < AC < BC C. BC < AC < AB D. BC < AB < AC