Idiot\'s Guides Basic Math and Pre-Algebra
Chapter 13: Triangles 169 In 'RST, mS = 43r and mR = 28r. The measure of the exterior angle of the triangle at T is equal to t ...
170 Part 3: The Shape of the World CHECK POINT In 'RST, mR = 48r and mT = 102r. Find the measure of S. In 'RST (described i ...
Chapter 13: Triangles 171 An isosceles triangle has two sides that are the same length. The congruent sides are called the legs, ...
172 Part 3: The Shape of the World If a triangle has an obtuse angle, an angle greater than 90r, it’s called an obtuse triangle. ...
Chapter 13: Triangles 173 Hypotenuse Leg Leg In a right triangle, the two sides that form the right angle are called legs, and t ...
174 Part 3: The Shape of the World DEFINITION The Pythagorean theorem states that for any right triangle, the square of the hypo ...
Chapter 13: Triangles 175 You can use the Pythagorean theorem to find a leg, too, if you know one leg and the hypotenuse. Suppos ...
176 Part 3: The Shape of the World Special Right Triangles The Pythagorean triples show up a lot when you’re working with right ...
Chapter 13: Triangles 177 The side opposite the 60r angle must be half the hypotenuse times the square root of 3. So if you know ...
178 Part 3: The Shape of the World CHECK POINT 16. 'ABC is a 30r-60r-90r right triangle, with hypotenuse 8 cm long. Find the len ...
Chapter 13: Triangles 179 altitude drawn from the opposite vertex, perpendicular to the base. This can sometimes cause the altit ...
180 Part 3: The Shape of the World CHECK POINT Find the area of a triangle with a base 14 cm long and an altitude of 7 cm. If t ...
CHAPTER 14 Quadrilaterals and Other Polygons ....................................... In This Chapter The properties of Paralle ...
182 Part 3: The Shape of the World A parallelogram is a quadrilateral with two pairs of opposite sides parallel. Whenever you lo ...
Chapter 14: Quadrilaterals 183 Drawing one diagonal in a parallelogram divides it into two matching triangles. When both diagona ...
184 Part 3: The Shape of the World Rectangles .................................................................................. ...
Chapter 14: Quadrilaterals 185 Rhombuses and Squares............................................................................ ...
186 Part 3: The Shape of the World CHECK POINT For each quadrilateral described, choose the best label from parallelogram, recta ...
Chapter 14: Quadrilaterals 187 If the nonparallel sides are congruent, the trapezoid is an isosceles trapezoid. You might have g ...
188 Part 3: The Shape of the World Perimeter of Quadrilaterals It’s easy to calculate the perimeter of quadrilaterals. Just as w ...
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