1. Holt CA Course 2 1-1 Evaluating Algebraic Expressions Preview 9-1 Perimeter and Area of ParallelogramsPerimeter and Area of Parallelograms 9-2 Perimeter and Area of Triangles and TrapezoidsPerimeter and Area of Triangles andTrapezoids 9-3 CirclesCircles 9-4 Circumference and AreaCircumference and Area 9-5 Area of Composite FiguresArea of Composite Figures 9-6 Area of Irregular FiguresArea of Irregular Figures Warm Ups

2. Holt CA Course 2 1-1 Evaluating Algebraic Expressions 9-1 Perimeter and Area of Parallelograms Warm Up Graph the line segment for each set of ordered pairs. Then find the length of the line segment. 1. (–7, 0), (0, 0) 2. (0, 3), (0, 6) 3. (–4, –2), (1, –2) 4. (–5, 4), (–5, –2) 7 units 3 units 5 units 6 units

3. Holt CA Course 2 1-1 Evaluating Algebraic Expressions Warm Up A rectangle has sides lengths of 12 ft and 20 ft. 2. Find the area. 1. Find the perimeter. 64 ft 240 ft 2 9-2 Perimeter and Area of Triangles and Trapezoids

4. Holt CA Course 2 1-1 Evaluating Algebraic Expressions Warm Up 1. Two angles are supplementary. One angle measures 61°. Find the measure of the other angle. 2. Two angles are complementary. One angle measures 19°. Find the measure of the other angle. 3. Two angles are supplementary and congruent. Find the measure of each angle. 119° 71° 90° 9-3 Circles

5. Holt CA Course 2 1-1 Evaluating Algebraic Expressions Warm Up 1. Find the length of the hypotenuse of a right triangle that has legs 3 in. and 4 in. long. 2. The hypotenuse of a right triangle measures 17 in., and one leg measures 8 in. How long is the other leg? 3. To the nearest centimeter, what is the height of an equilateral triangle with sides 9 cm long? 5 in. 15 in. 8 cm 9-4 Circumference and Area

6. Holt CA Course 2 1-1 Evaluating Algebraic Expressions Warm Up Find each area. Round to the nearest tenth, if necessary. 1. a rectangle with length 10 cm and width 4 cm 2. a parallelogram with base 18 ft and height 12 ft 3. a triangle with base 16 cm and height 8 cm 4. a circle with radius 5 in. 40 cm 2 216 ft 2 64 cm 2 78.5 in 2 9-5 Area of Composite Figures

7. Holt CA Course 2 1-1 Evaluating Algebraic Expressions Warm Up Find the area of each figure. Round to the nearest tenth, if necessary. 1. a trapezoid with bases 10 cm and 12 cm and height 5 m 2. a parallelogram with base 9 in. and height 8 in. 3. a semicircle with radius 5 m 4. a semicircle with diameter 8 cm 55 cm 2 72 in 2 39.3 m 2 25.1 cm 2 9-6 Area of Irregular Figures