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Warm
Ups
1-1
Evaluating
Algebraic Expressions
Preview
9-1 Perimeter and Area of Parallelograms
9-2 Perimeter and Area of Triangles and
Trapezoids
9-3 Circles
9-4 Circumference and Area
9-5 Area of Composite Figures
9-6 Area of Irregular Figures
Holt CA Course 2
9-1
and Area
of Parallelograms
1-1Perimeter
Evaluating
Algebraic
Expressions
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)
7 units
2. (0, 3), (0, 6)
3 units
3. (–4, –2), (1, –2) 5 units
4. (–5, 4), (–5, –2) 6 units
Holt CA Course 2
9-2
and Area
of Triangles and
Trapezoids
1-1Perimeter
Evaluating
Algebraic
Expressions
Warm Up
A rectangle has sides lengths of 12 ft
and 20 ft.
1. Find the perimeter.
64 ft
2. Find the area.
240 ft2
Holt CA Course 2
9-3
1-1Circles
Evaluating
Algebraic Expressions
Warm Up
1. Two angles are supplementary. One angle
measures 61°. Find the measure of the other
angle. 119°
2. Two angles are complementary. One angle
measures 19°. Find the measure of the other
angle. 71°
3. Two angles are supplementary and congruent.
Find the measure of each angle. 90°
Holt CA Course 2
9-4
andAlgebraic
Area
1-1Circumference
Evaluating
Expressions
Warm Up
1. Find the length of the hypotenuse of a right
triangle that has legs 3 in. and 4 in. long.
5 in.
2. The hypotenuse of a right triangle measures 17
in., and one leg measures 8 in. How long is the
other leg?
15 in.
3. To the nearest centimeter, what is the height of
an equilateral triangle with sides 9 cm long?
8 cm
Holt CA Course 2
9-5
of CompositeAlgebraic
Figures
1-1Area
Evaluating
Expressions
Warm Up
Find each area. Round to the nearest tenth, if
necessary.
1. a rectangle with length 10 cm and width 4 cm
40 cm2
2. a parallelogram with base 18 ft and height 12 ft
216 ft2
3. a triangle with base 16 cm and height 8 cm
64 cm2
4. a circle with radius 5 in.
78.5 in2
Holt CA Course 2
9-6
of Irregular Figures
1-1Area
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
55 cm2
2. a parallelogram with base 9 in. and height 8 in.
72 in2
3. a semicircle with radius 5 m
39.3 m2
4. a semicircle with diameter 8 cm
25.1 cm2
Holt CA Course 2