美國加州數(shù)學(xué)課本california mathematics - grade 5k第五冊(cè)

1、This is trial version www.adultpdf.com602 Chapter 11 Measurement: Perimeter, Area, and Volume17. Algebra The table at the right shows the areas of a triangle where the base of the triangle stays the same but the height c

2、hanges. Write an algebraic expression that can be used to find the area of a triangle that has a base of 5 units and a height of n units. 18. Which is smaller, a triangle with an area of 1 square foot or a triangle with

3、an area of 64 square inches? Find the perimeter and area of each figure. 19.5 in.4 in.2 in.5 in.20. 9 mm 6 mm9 mm10 mm 10 mm 8 mm 8 mm6 mm21. FIND THE ERROR Susana and D.J. are finding the area of 28 m17

4、m42 mthe triangle. Who is correct? Explain your reasoning. SusanaA = 1 _ 2 (28)(42)A = 588 m2D.J.A = 1 _ 2 (17)(42)A = 357 m2CHALLENGE For Exercises 22–24, use the information below. The four shaded triangles in

5、the figure shown are congruent.76 units56 units22. Calculate the area of the figure. 23. Find the measure of the base and height of the four smaller triangles. 24. Calculate the area of one small triangle. Is this answ

6、er reasonable? Explain. 25. OPEN ENDED Draw two different triangles each having an area of 24 square feet. Area of TrianglesBase (units) Height (units) Area (units2)5 2 55 4 105 6 155 8 205 n ?(l)Big Cheese Photo/Supe