SAT Subject Test Mathematics Level 1
Figure 4 As you read the stem, you might wonder what an isosceles trapezoid is. If you’d never heard the ...
ADD TO THE FIGURE Often the breakthrough on a plane geometry problem comes when you add a line segment o ...
One leg is 6 + 9 = 15, and the other leg is 8; therefore the hypotenuse AC is as follows. So AC = 17 and ...
Think of this formula as the average of the bases (the two parallel sides) times the height (the length of ...
Remember that to find the area of a parallelogram, you need the height, which is the perpendicular dist ...
The area of a 7-by-3 rectangle is 7 × 3 = 21. Rhombus: A rhombus is a four-sided figure with four ...
The square above, with sides of length 5, has an area of 5^2 = 25. POLYGONS—PERIMETER AND AREA The test ...
The way to get started with this question is to sketch what’s described in the question. A square of area ...
draw in three diagonals and turn the hexagon into six equilateral triangles of side 1. Each of those si ...
CIRCLES—FOUR FORMULAS After the triangle, the test makers’ favorite plane geometry figure is the circle. Cir ...
Circumference = πd In the circle above, the radius is 3, so the circumference is 2π(3) = 6π. FOUR CIRCLE FO ...
In the figure above, the radius is 5, and the measure of the central angle is 72°. The arc length is of the cir ...
In the figure above, the radius is 6, and the measure of the sector’s central angle is 30°. The sector has ...
Figure 5 Once again, the key here is to add to the figure. And in this case, as so often when there’s a ...
The shaded region is what’s left of the 120° sector after you subtract the triangle with the 120° vert ...
The area of each 30-60-90 triangle is so the area of the triangle with the 120° vertex is twic ...
Similar Figures The area ratio between similar figures is the square of the side ratio. Three Special Triangle T ...
The 5-12-13 Triangle The 45-45-90 Triangle The 30-60-90 Triangle ...
Five Special Quadrilateral Types Polygon Angles For any polygon of n sides: Trapezoid: 1. 2. Parallelogram: Area of Pa ...
Four Circle Formulas Sum of Exterior Angles = 360° Circumference = 2πr = πd Area of a Circle = πr^2 ...
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