UNIT 13 Areas: CSEC Revision Test
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1 Area of square 64 cm (4 marks) MEP Jamaica: STRAND E : 1. The shaded square has sides of length 1 cm. It is enlarged a number of times as shown. Complete the table. Length of side of square 1 cm cm 3 cm 4 cm Perimeter of square 4 cm 8 cm 1 cm Area of square 1 cm 4 cm 16 cm The shaded square continues to be enlarged. Complete the following table. Length of side of square Perimeter of square. 5 m 4 m Not to scale Door 1 m 3 m 11 m The diagram shows the plan of the floor of a room. Calculate the perimeter of the room. Wooden skirting board is fitted around the perimeter, but not across the doorway. It costs J$83 per metre. Calculate the cost of the skirting board needed for this room. (c) Calculate the area of the floor of the room. CIMT and e-learning Jamaica 1
2 : (d) Carpet tiles measure 1 m by 1 m. They are sold in boxes each containing 1 tiles. Each box costs J$ (i) How many boxes are needed to carpet this floor area? (ii) What is their total cost? (7 marks) 3. A shop sells square carpet tiles in two different sizes. Small Large 30 cm 30 cm 500 cm Not to scale (c) What is the area of a small carpet tile? What is the length of a side of a large carpet tile? The floor of a rectangular room is 300 cm long and 180 cm wide. How many small tiles are needed to carpet the floor? (4 marks) 4. A circle fits inside a semicircle of diameter 10 cm as shown. 10 cm Calculate the shaded area. (3 marks) CIMT and e-learning Jamaica
3 : 5. A piece of wire is bent in the form of a circle and it encloses an area of 154 cm. (i) Calculate: the radius of the circle the circumference of the circle. (Use π = 7 ) The same piece of wire is then bent in the form of a square. (ii) Calculate the area enclosed by the square. (CXC) (6 marks) 6. The figures shown below, not drawn to scale, represent the cross sections of two circular pizzas. Both pizzas are equally thick and contain the same toppings. 15 cm 30 cm Small pizza Medium pizza Diameter = 15 cm Diameter = 30 cm Is a medium pizza twice as large as a small pizza? Use calculations to support your answer. A medium pizza is cut into 3 equal parts, and each part is sold for $ A small pizza is sold for $1.95. Which is the better buy? Use calculations to support your answer. (CXC) (10 marks) CIMT and e-learning Jamaica 3
4 : 7. The diagram below, not drawn to scale, shows a rectangle ABCE joined along the edge EC to a quarter circle ECD, so that AED is a straight line. AB = 7 cm and BC = 5 cm. D E C 5 cm A 7 cm B Write down the length of AD. Use π = 7. (i) (c) Calculate the length of the arc CD (ii) the perimeter of the figure ABCDE (iii) the area of the figure ABCDE. If the diagram is drawn to a scale of 1:100, find the actual area of rectangle ABCE in square metres. (CXC) (10 marks) CIMT and e-learning Jamaica 4
5 : 8. A lampshade is made from the piece of material ABCD shown. Angle AOB = 33, OB = 55 cm, OC = OD = 67 cm. O cm 67 cm D A B C Not to scale Calculate the area of the sector OAB. ( marks) Calculate the area ABCD. ( marks) (c) Calculate the arc length AB. ( marks) When the lampshade is made the ends AD and BC are joined together. The arcs AB and DC form two circles. (d) Calculate the radius of the circle formed by the arc AB. ( marks) TOTAL MARKS: 5 CIMT and e-learning Jamaica 5
6 : ANSWERS 1. Perimeter = 16 cm B1 Area = 9 cm B1 Length = 8 cm B1 Perimeter = 3 cm B1 (4 marks) = 36 cm B = J$ 905 ( ) = (c) Area = m 53 m (d) (i) 5 boxes B1 (ii) J$ B1 (7 marks) cm B1 50 cm B1 (c) Need 10 6 = 60 small tiles (4 marks) 4. 1 Shaded area = 5 5 π π 5 = π cm 4 A1 (3 marks) 5. (i) 154 = π r ; r 154 = = 49 ( π ) M1 r = 7 cm A1 circumference = π 7 = 14 = 44 cm 7 (ii) Side length = 11 cm M1 Area enclosed = 11 cm A1 (6 marks) 6. Small pizza area = π 15 = Medium pizza area = π( ) = 5 4 π 15 5π So medium pizza is 4 times as large as small pizza, not twice as large. Total cost for medium pizza = 3 $ = $ cost of small pizza = 4 $ 195. = $ So the medium pizza is the better buy. B1 (10 marks) B1 CIMT and e-learning Jamaica 61
7 : ANSWERS 7. AD = = 1 cm B1 1 (i) CD =. ( π 7) = 11cm 4 (ii) Perimeter = ( ) cm = 35 cm 1 (iii) Area = ( 7 5) + ( π 4 7 ) 77 = 35 + = 73 1 cm A1 (c) 147 Actual area = cm M1 = 147 m A1 (10 marks) 8. Area = 33 π 55 = cm Area = π ( ) = cm (c) AB = π 55 = cm 360 (d) πr = cm (8 marks) (TOTAL MARKS: 5) CIMT and e-learning Jamaica 7
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