1. A triangular flaglet has a base of 40 centimeters and a height of 24 centimeters. How many square centimeters of material were used in making it? 2. A playground in the shape of a parallelogram has a base of 60 meters and a height of 45 meters. What is its area? 3. The area of a rectangle is 48 cm2. If its width is 6 cm, what is its length?. 4. A handkerchief in a square shape has a side of 25 cm. What is its area? 5. The trapezoid bases are 7cm and 11 cm. Its height is 4 cm. What is the area of the trapezoid?
Answers & Comments
Answer:
1. What is asked: Area of a triangle
Given facts: base = 40 cm height = 24 cm
Operation: multiplication
Number sentence: A = 1/2 bh
Solution: A = 1/2 bh = 1/2 (40 cm)(24 cm) = 480
2. What is asked: Area of parallelogram
Given facts: base = 60 m height = 45 cm
Operation: multiplication
Number sentence: A = bh
Solution: A = bh = 60 cm(45 cm) = 2,700
3. What is asked: Length of a rectangle
Given facts: A = 48 width = 6 cm
Operation: division
Number sentence: L = A/w
Solution: L = 48 / 6 cm = 8 cm
4. What is asked: Area of a handkerchief
Given facts: side = 25 cm
Operation: multiplication
Number sentence: A =
Solution: A = = = 625
5. What is asked: Area of the trapezoid
Given facts: Bases = 7 cm and 11 cm height = 4 cm
Operation: division, multiplication and addition
Number sentence: A = h
Solution: A = h = (7 cm + 11 cm)/2 (4 cm) = 36
Step-by-step explanation:
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