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2.2.1 Units of Measure

2.2.2 Areas of Triangles

2.2.1 Units of Measure

An important part of measurement is choosing an appropriate unit of measurement.

What measurement can best describe each of these situations? (Feet? Inches? Liters?)

1. The distance you travel from home to get to school.2. The surface of the football field.3. The width of a strand of hair.4. The length of your nose.5. The amount of room in your locker.

Area of Composite Shapes

♥ Break the shape down into bite-sized pieces.♥ Area of a rectangle = base x height A = bh♥ LOOK FOR THE RIGHT ANGLE TO DEFINE YOUR

BASE & HEIGHT…ALWAYS!!

Area of Triangles

Area of a triangle = ½ x base x height A = 1/2bh

LOOK FOR THE RIGHT ANGLE TO DEFINE BASE AND HEIGHT…. ALWAYS!!!!!!!!!!!!!!!!!!!

“FIND THE AREA OF THE SHADED PORTION”

1. Find the area of the large shape.

2. Find the area of the small shape.

3. Subtract them

4. Label your answer.

5 in.

10 in.

2 in.

6 in.

(5 )(10) = 50

(2)( 6) = 12

50 – 12 = 38

38 in2

Try these…

7 in.

12 in.5 in.

8 in.

Large area = (7)(12) = 84

Small area = ½(5)(7) = 17.5

Subtract them = 66.5

Label…. 66.5 sq. in.

9 ft.

14 ft.

16.6 ft.

7.5 ft.Large area = (9)(14) = 126

Small area = ½(9)(11) = 49.5

Subtract them = 76.5

Label…. 76.5 sq. ft. 11 ft.

Your Assignment

Pg 100-105

62, 63, 65ab, 70-74, not 73