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Estimating and Finding Area. 10-1. Course 1. Warm Up. Problem of the Day. Lesson Presentation. Estimating and Finding Area. 10-1. Course 1. Warm Up 1. What is the perimeter of a square with side lengths of 15 in.?

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10-1

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  1. Estimating and Finding Area 10-1 Course 1 Warm Up Problem of the Day Lesson Presentation

  2. Estimating and Finding Area 10-1 Course 1 Warm Up 1.What is the perimeter of a square with side lengths of 15 in.? 2. What is the perimeter of a rectangle with length 16 cm and width 11 cm? 60 in. 54 cm

  3. Estimating and Finding Area 10-1 Course 1 Learn to estimate the area of irregular figures and to find the area of rectangles.

  4. Estimating and Finding Area 10-1 Course 1 Insert Lesson Title Here Vocabulary area

  5. Estimating and Finding Area 10-1 Course 1 The area of a figure is the amount of surface it covers. We measure area in square units.

  6. Estimating and Finding Area 10-1 2 The area of the figure is about 30 mi . Course 1 Additional Example 1: Estimating the Area of an Irregular Figure Find the area of the rectangle. Count full squares: 19 red squares. Count almost-full squares: 9 blue squares. Count squares that are about half-full: 4 green squares = 2 full squares. Do not count almost empty yellow squares. Add. 19 + 9 + 2 = 30

  7. Estimating and Finding Area 10-1 2 The area of the figure is about 18 mi . Course 1 Check It Out: Example 1 Estimate the are of the figure. Count full squares: 11 red squares. Count almost-full squares: 5 green squares. Count squares that are about half-full: 4 blue squares = 2 full squares. = mi2 Do not count almost empty yellow squares. Add. 11 + 5 + 2 = 18

  8. Estimating and Finding Area 10-1 Course 1

  9. Estimating and Finding Area 10-1 A =lw A = 15 •9 A = 135 The area is about 135 in2. Course 1 Additional Example 2: Finding the Area of a Rectangle Find the area of the figure. Write the formula. 15 in. Substitute 15 for l. 9 in. Substitute 9 for w.

  10. Estimating and Finding Area 10-1 A =lw A = 13 •7 A = 91 Course 1 Check It Out: Example 2 Find the area of the figure. Write the formula. 13 in. Substitute 13 for l. 7 in. Substitute 7 for w. The area is about 91 in2.

  11. Estimating and Finding Area 10-1 221 – 18 = 203 The area of the kitchen to be tiled is 203 ft2. To find the area to be tiled, subtract the area of the island from the area of the floor. Course 1 Additional Example 4: Recreation Application Jessika is going to tile a kitchen that measures 13 ft by 17 ft. Some floor space is taken up by an island that measures 3 ft by 6 ft. How much area remains to be tiled in the kitchen? - = floor area island kitchen area to be tiled Substitute for l and w in A = lw. - = (13 • 17) (3 • 6) n Use the order of operations.

  12. Estimating and Finding Area 10-1 41.4 m2 160 in2 Course 1 Insert Lesson Title Here Lesson Quiz Find the area of each figure. 1. 2. What is the area of a parallelogram with base 16 in. and height 10 in.? 3. A square fish pond that is 6 ft long is surrounded by a square walk that is 18 ft long. What is the area covered by the walk? 4.5 m 9.2 m

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