SAT Subject Test Mathematics Level 1
Try to put all the given information into the figure so that you can see everything at a glance and don’t have ...
In the figure above, x + 50 + 100 = 180, so x = 30. Measure of an exterior angle: The measure of an ...
the area of a triangle is always the same. The formula is this: The height is the perpendicular distance be ...
SIMILAR TRIANGLES In Example 2 you’re asked to express the area of one triangle in terms of the area of an ...
SIMILAR FIGURES The area ratio between similar figures is the square of the side ratio. You might wonder how yo ...
Alternative method: If you didn’t see the similar triangles, or if you didn’t know for sure how the area of the l ...
Be sure you know not just the definitions of these triangle types but, more importantly, their special ...
Pythagorean theorem: If you know any two sides of a right triangle, you can find the third side by usin ...
For all right triangles, (leg 1 )^2 + (leg 2 )^2 = (hypotenuse)^2. Pythagorean triplet: A Pythagorean triplet is ...
3-4-5 triangle: If a right triangle’s leg-to-leg ratio is 3:4, or if the leg-to- hypotenuse ratio is 3:5 ...
In the right triangle shown, one leg is 30 and the hypotenuse is 50. This is 10 times 3-4-5. The other leg i ...
If one leg is 3, then the other leg is also 3, and the hypotenuse is equal to a leg times 30-60-90 tri ...
Figure 3 To get the answer to this question, you need to know about equilateral, 45-45- 90, and 30-60-90 ...
Using the side ratios for 30-60-90s and 45-45-90s, you know that and that Therefore, The answer is (D). HI ...
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 ...
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